Ignore errors from chrome.tabs.executeScript.

chrome/browser/resources/hotword/page_audio_manager.js

 // Copyright 2014 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.
 
 cr.define('hotword', function() {
   'use strict';
 
   /**
    * Class used to manage the interaction between hotwording and the
    * NTP/google.com. Injects a content script to interact with NTP/google.com
@@ skipping 146 matching lines @@
 
     /**
      * Prepare a new or updated tab by injecting the content script.
      * @param {!Tab} tab Newly updated or created tab.
      * @private
      */
     prepareTab_: function(tab) {
       if (!this.isEligibleUrl_(tab.url))
         return;
 
-      chrome.tabs.executeScript(tab.id, {'file': 'audio_client.js'});
+      chrome.tabs.executeScript(
+          tab.id,
+          {'file': 'audio_client.js'},
+          function(results) {
+            if (chrome.runtime.lastError) {
+              // Ignore this error. For new tab pages, even though the URL is
+              // reported to be chrome://newtab/, the actual URL is a
+              // country-specific google domain. Since we don't have permission
+              // to inject on every page, an error will happen when the user is
+              // in an unsupported country.
+              //
+              // The property still needs to be accessed so that the error
+              // condition is cleared. If it isn't, exectureScript will log an
+              // error the next time it is called.
+            }
+          });
     },
 
     /**
      * Updates hotwording state based on the state of current tabs/windows.
      * @private
      */
     updateTabState_: function() {
       this.findCurrentTab_(this.activateTab_);
     },
 
@@ skipping 247 matching lines @@
         this.stopHotwording_();
         this.disconnectAllClients_();
       }
     }
   };
 
   return {
     PageAudioManager: PageAudioManager
   };
 });