make chrome.tabs.executeScript/insertCss details arg required

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 706 matching lines @@
         "parameters": [
           {"type": "integer", "name": "tabId", "optional": true, "description": "The id of tab which run the script, default to selected tab of current window."},
           {
             "type": "object",
             "name": "details",
             "description": "Details of the script to run. Either the code or file property must be set, but both may not be set at the same time.",
             "properties": {
               "code": {"type": "string", "optional": true, "description": "JavaScript code to execute."},
               "file": {"type": "string", "optional": true, "description": "JavaScript file to execute."},
               "allFrames": {"type": "boolean", "optional": true, "description": "If allFrames is true, this function injects script into all frames of current page. By default, it's false and only inject script into top main frame."}
-            },
-            "optional": true
+            }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "When all scripts are executed, this callback is called.",
             "parameters": []
           }
         ]
       },
       {
         "name": "insertCSS",
         "type": "function",
         "description": "",
         "parameters": [
           {"type": "integer", "name": "tabId", "optional": true, "description": "The id of tab which run the script, default to selected tab of current window."},
           {
             "type": "object",
             "name": "details",
             "description": "Details of the css text to insert. Either the code or file property must be set, but both may not be set at the same time.",
             "properties": {
               "code": {"type": "string", "optional": true, "description": "CSS code to be injected."},
               "file": {"type": "string", "optional": true, "description": "CSS file to be injected."},
               "allFrames": {"type": "boolean", "optional": true, "description": "If allFrames is true, this function injects css text into all frames of current page. By default, it's false and only inject css text into top main frame."}
-            },
-            "optional": true
+            }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "When all css are inserted, this callback is called.",
             "parameters": []
           }
         ]
       }
@@ skipping 1185 matching lines @@
         "type": "function",
         "description": "Logs a message during internal unit testing.",
         "parameters": [
           {"type": "string", "name": "message"}
         ]
       }
     ],
     "events": []
   }
 ]