Make URL filter for web request API mandatory

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
           "tab": {"$ref": "Tab", "optional": true, "description":"This property will <b>only</b> be present when the connection was opened from a tab or content script."},
@@ skipping 5802 matching lines @@
   {
     "namespace": "webRequest",
     "types": [
       {
         "id": "RequestFilter",
         "type": "object",
         "description": "An object describing filters to apply to webRequest events.",
         "properties": {
           "urls": {
             "type": "array",
-            "optional": true,
             "description": "A list of URLs or URL patterns. Requests that cannot match any of the URLs will be filtered out.",
             "items": { "type": "string" }
           },
           "types": {
             "type": "array",
             "optional": true,
             "description": "A list of request types. Requests that cannot match any of the types will be filtered out.",
             "items": { "type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"] }
           },
           "tabId": { "type": "integer", "optional": true },
@@ skipping 58 matching lines @@
     "functions": [
       {
         "name": "addEventListener",
         "nodoc": true,
         "type": "function",
         "description": "Used internally to implement the special form of addListener for the webRequest events.",
         "parameters": [
           {"type": "function", "name": "callback"},
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 46 matching lines @@
               "parentFrameId": {"type": "integer", "description": "ID of frame that wraps the frame which sent the request. Set to -1 if no parent frame exists."},
               "tabId": {"type": "integer", "description": "The ID of the tab in which the request takes place. Set to -1 if the request isn't related to a tab."},
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 24 matching lines @@
               "tabId": {"type": "integer", "description": "The ID of the tab in which the request takes place. Set to -1 if the request isn't related to a tab."},
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."},
               "requestHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP request headers that are going to be sent out with this request."}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 24 matching lines @@
               "tabId": {"type": "integer", "description": "The ID of the tab in which the request takes place. Set to -1 if the request isn't related to a tab."},
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."},
               "requestHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP request headers that have been sent out with this request."}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 20 matching lines @@
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."},
               "statusLine": {"type": "string", "optional": true, "description": "HTTP status line of the response"},
               "responseHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP response headers that have been received with this response."}
              }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 37 matching lines @@
             "optional": true,
             "name": "callback",
             "parameters": [
               {"name": "response", "$ref": "BlockingResponse"}
             ]
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 28 matching lines @@
               "fromCache": {"type": "boolean", "description": "Indicates if this response was fetched from disk cache."},
               "statusCode": {"type": "integer", "description": "Standard HTTP status code returned by the server."},
               "responseHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP response headers that were received along with this response."},
               "statusLine": {"type": "string", "optional": true, "description": "HTTP status line of the response"}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 24 matching lines @@
               "statusCode": {"type": "integer", "description": "Standard HTTP status code returned by the server."},
               "redirectUrl": {"type": "string", "description": "The new URL."},
               "responseHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP response headers that were received along with this redirect."},
               "statusLine": {"type": "string", "optional": true, "description": "HTTP status line of the response"}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 23 matching lines @@
               "fromCache": {"type": "boolean", "description": "Indicates if this response was fetched from disk cache."},
               "statusCode": {"type": "integer", "description": "Standard HTTP status code returned by the server."},
               "responseHeaders": {"$ref": "HttpHeaders", "optional": true, "description": "The HTTP response headers that were received along with this response."},
               "statusLine": {"type": "string", "optional": true, "description": "HTTP status line of the response"}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
           {
             "type": "array",
             "optional": true,
             "name": "extraInfoSpec",
             "description": "Array of extra information that should be passed to the listener function.",
             "items": {
               "type": "string",
@@ skipping 21 matching lines @@
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."},
               "ip": {"type": "string", "optional": true, "description": "The server IP address that the request was actually sent to. Note that it may be a literal IPv6 address."},
               "fromCache": {"type": "boolean", "description": "Indicates if this response was fetched from disk cache."},
               "error": {"type": "string", "description": "The error description. This string is <em>not</em> guaranteed to remain backwards compatible between releases. You must not parse and act based upon its content."}
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           }
         ]
       }
     ]
   },
   {
     "namespace": "test",
     "nodoc": true,
@@ skipping 3032 matching lines @@
                 "enum": ["enabled", "disabled", "forced"],
                 "description": "Exposes whether the incognito mode is available to windows. One of 'enabled', 'disabled' (user cannot browse pages in Incognito mode), 'forced' (all pages/sessions are forced into Incognito mode)."
               }
             ]
           }
         ]
       }
     ]
   }
 ]