Fix channel check for fatal error suppression.

chrome/renderer/resources/extensions/last_error.js

 // 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.
 
 var GetAvailability = requireNative('v8_context').GetAvailability;
 var GetGlobal = requireNative('sendRequest').GetGlobal;
 
 // Utility for setting chrome.*.lastError.
 //
 // A utility here is useful for two reasons:
@@ skipping 10 matching lines @@
 function set(name, message, stack, targetChrome) {
   var errorMessage = name + ': ' + message;
   if (stack != null && stack != '')
     errorMessage += '\n' + stack;
 
   if (!targetChrome)
     throw new Error('No chrome object to set error: ' + errorMessage);
   clear(targetChrome);  // in case somebody has set a sneaky getter/setter
 
   var errorObject = { message: message };
-  if (targetChrome && targetChrome.extension)
+  if (GetAvailability('extension.lastError').is_available)
     targetChrome.extension.lastError = errorObject;
 
   assertRuntimeIsAvailable();
 
   // We check to see if developers access runtime.lastError in order to decide
   // whether or not to log it in the (error) console.
   privates(targetChrome.runtime).accessedLastError = false;
   $Object.defineProperty(targetChrome.runtime, 'lastError', {
       configurable: true,
       get: function() {
@@ skipping 32 matching lines @@
   return false;
 };
 
 /**
  * Clears the last error on |targetChrome|.
  */
 function clear(targetChrome) {
   if (!targetChrome)
     throw new Error('No target chrome to clear error');
 
-  if (targetChrome && targetChrome.extension)
+  if (GetAvailability('extension.lastError').is_available)
    delete targetChrome.extension.lastError;
 
   assertRuntimeIsAvailable();
   delete targetChrome.runtime.lastError;
   delete privates(targetChrome.runtime).accessedLastError;
 };
 
 function assertRuntimeIsAvailable() {
   // chrome.runtime should always be available, but maybe it's disappeared for
   // some reason? Add debugging for http://crbug.com/258526.
@@ skipping 20 matching lines @@
   } finally {
     clear(targetChrome);
   }
 }
 
 exports.clear = clear;
 exports.hasAccessed = hasAccessed;
 exports.hasError = hasError;
 exports.set = set;
 exports.run = run;