Use extension match pattern syntax in content settings extension API

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 5784 matching lines @@
           },
           "description": {
             "type": "string",
             "optional": true,
             "description": "A human readable description of the resource."
           }
         },
         "description": "Currently, no content types use resource identifiers."
       },
       {
-        "id": "Pattern",
-        "type": "object",
-        "properties": {
-          "pattern": {
-            "type": "string",
-            "description": "The pattern string. The pattern should never be constructed directly, but should always be derived from an URL using the methods in the <var>contentSettings.patterns</var> module."
-          }
-        }
-      },
-      {
         "id": "ContentSettingRule",
         "type": "object",
         "properties": {
           "topLevelPattern": {
-            "$ref": "Pattern",
-            "description": "The pattern for the top-level frame URL."
+            "type": "string",
+            "description": "The pattern for the top-level frame URL. For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
           },
           "embeddedPattern": {
-            "$ref": "Pattern",
-            "description": "The pattern for the frame or object URL."
+            "type": "string",
+            "description": "The pattern for the frame or object URL. For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
           },
           "resourceIdentifier": {
             "$ref": "ResourceIdentifier",
             "optional": true,
             "description": "The resource identifier for the content type."
           },
           "setting": {
             "type": "any",
             "description": "The setting applied by this rule. See the description of the individual ContentSetting objects for the possible values."
           }
@@ skipping 78 matching lines @@
           {
             "name": "set",
             "type": "function",
             "description": "Apply a new content setting rule.",
             "parameters": [
               {
                 "name": "details",
                 "type": "object",
                 "properties": {
                   "topLevelPattern": {
-                    "$ref": "Pattern",
-                    "description": "The pattern for the top-level frame URL."
+                    "type": "string",
+                    "description": "The pattern for the top-level frame URL. For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
                   },
                   "embeddedPattern": {
-                    "$ref": "Pattern",
-                    "description": "The pattern for the frame or object URL."
+                    "type": "string",
+                    "description": "The pattern for the frame or object URL. For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
                   },
                   "resourceIdentifier": {
                     "$ref": "ResourceIdentifier",
                     "optional": true,
                     "description": "The resource identifier for the content type."
                   },
                   "setting": {
                     "type": "any",
                     "description": "The setting applied by this rule. See the description of the individual ContentSetting objects for the possible values."
                   },
@@ skipping 226 matching lines @@
           {
             "type": "integer",
             "name": "tabId",
             "description": "The id of the tab that was detached."
           }
         ]
       }
     ]
   }
 ]