Make URL filter for web request API mandatory

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
diff --git a/chrome/common/extensions/api/extension_api.json b/chrome/common/extensions/api/extension_api.json
index 42b64f707f69904b055272598cdea5545aa86284..7ec7d369de87c8dee4884b2c0f6f94958bfd8280 100644
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -5820,7 +5820,6 @@
         "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" }
           },
@@ -5899,7 +5898,6 @@
           {"type": "function", "name": "callback"},
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -5966,7 +5964,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6011,7 +6008,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6056,7 +6052,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6097,7 +6092,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6155,7 +6149,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6204,7 +6197,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6249,7 +6241,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6293,7 +6284,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           },
@@ -6335,7 +6325,6 @@
         "extraParameters": [
           {
             "$ref": "RequestFilter",
-            "optional": true,
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           }