Add enableReferrers and enableHyperlinkAuditing to contentSettings.misc 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 4898 matching lines @@
       }
     ]
   },
   {
     "namespace": "experimental.contentSettings.misc",
     "properties": {
       "blockThirdPartyCookies": {
         "$ref": "Preference",
         "value": ["blockThirdPartyCookies", {"type": "boolean"}],
         "description": "Whether third party cookies should be blocked. The value of this preference is of type boolean."
+      },
+      "enableReferrers": {
+        "$ref": "Preference",
+        "value": ["enableReferrers", {"type":"boolean"}],
+        "description": "Whether referrers should be enabled. The value of this preference is of type boolean."
+      },
+      "enableHyperlinkAuditing": {
+        "$ref": "Preference",
+        "value": ["enableHyperlinkAuditing", {"type":"boolean"}],
+        "description": "Whether to enable hyperlink auditing (\"<a ping>\"). The value of this preference is of type boolean."
       }
     }
   },
   {
     "namespace": "experimental.debugger",
     "functions": [
       {
         "name": "attach",
         "type": "function",
         "description": "Attaches debugger to the tab with given id.",
@@ skipping 107 matching lines @@
           {
             "type": "integer",
             "name": "tabId",
             "description": "The id of the tab that was detached."
           }
         ]
       }
     ]
   }
 ]