Make all extension api types fully qualified.

chrome/common/extensions/api/ttsEngine.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "ttsEngine",
     "dependencies": [ "tts" ],
     "functions": [
       {
         "name": "sendTtsEvent",
         "nodoc": true,
         "type": "function",
         "description": "Routes a TTS event from a speech engine to a client.",
         "parameters": [
           {
             "type": "integer",
             "name": "requestId"
           },
           {
             "name": "event",
-            "$ref": "TtsEvent",
+            "$ref": "tts.TtsEvent",
             "description": "The update event from the text-to-speech engine indicating the status of this utterance."
           }
         ]
       }
     ],
     "events": [
       {
         "name": "onSpeak",
         "type": "function",
         "description": "Called when the user makes a call to tts.speak() and one of the voices from this extension's manifest is the first to match the options object.",
@@ skipping 47 matching lines @@
               }
             }
           },
           {
             "name": "sendTtsEvent",
             "type": "function",
             "description": "Call this function with events that occur in the process of speaking the utterance.",
             "parameters": [
               {
                 "name": "event",
-                "$ref": "TtsEvent",
+                "$ref": "tts.TtsEvent",
                 "description": "The event from the text-to-speech engine indicating the status of this utterance."
               }
             ]
           }
         ]
       },
       {
         "name": "onStop",
         "type": "function",
         "description": "Fired when a call is made to tts.stop and this extension may be in the middle of speaking. If an extension receives a call to onStop and speech is already stopped, it should do nothing (not raise an error)."
       }
     ]
   }
 ]