Update references to the extension messaging APIs to point to the "runtime"

chrome/renderer/resources/extensions/extension_custom_bindings.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.
 
 // Custom bindings for the extension API.
 
 var extensionNatives = requireNative('extension');
 var GetExtensionViews = extensionNatives.GetExtensionViews;
 var runtimeNatives = requireNative('runtime');
 var OpenChannelToExtension = runtimeNatives.OpenChannelToExtension;
@@ skipping 52 matching lines @@
   });
 
   apiFunctions.setHandleRequest('getURL', function(path) {
     path = String(path);
     if (!path.length || path[0] != '/')
       path = '/' + path;
     return 'chrome-extension://' + extensionId + path;
   });
 
   // Alias several messaging deprecated APIs to their runtime counterparts.
-  chrome.extension.connect = chrome.runtime.connect;
-  chrome.extension.sendMessage = chrome.runtime.sendMessage;
-  chrome.extension.onConnect = chrome.runtime.onConnect;
-  chrome.extension.onMessage = chrome.runtime.onMessage;
-  if (contextType == 'BLESSED_EXTENSION') {
-    chrome.extension.connectNative = chrome.runtime.connectNative;
-    chrome.extension.sendNativeMessage = chrome.runtime.sendNativeMessage;
-    chrome.extension.onConnectExternal = chrome.runtime.onConnectExternal;
-    chrome.extension.onMessageExternal = chrome.runtime.onMessageExternal;
-  }
+  var mayNeedAlias = [
+    // Types
+    'Port',
+    // Functions
+    'connect', 'sendMessage', 'connectNative', 'sendNativeMessage',
+    // Events
+    'onConnect', 'onConnectExternal', 'onMessage', 'onMessageExternal'
+  ];
+  mayNeedAlias.forEach(function(alias) {
+    try {
+      // Deliberately accessing runtime[alias] rather than testing its
+      // existence, since accessing may throw an exception if this context
+      // doesn't have access.
+      if (chrome.runtime[alias])
+        chrome.extension[alias] = chrome.runtime[alias];
+    } catch(e) {}
+  });
 
   apiFunctions.setUpdateArgumentsPreValidate('sendRequest',
       sendMessageUpdateArguments.bind(null, 'sendRequest'));
 
   apiFunctions.setHandleRequest('sendRequest',
                                 function(targetId, request, responseCallback) {
     if (sendRequestIsDisabled)
       throw new Error(sendRequestIsDisabled);
     var port = chrome.runtime.connect(targetId || extensionId,
                                       {name: chromeHidden.kRequestChannel});
     chromeHidden.Port.sendMessageImpl(port, request, responseCallback);
   });
 
   if (sendRequestIsDisabled) {
     chrome.extension.onRequest.addListener = function() {
       throw new Error(sendRequestIsDisabled);
     };
     if (contextType == 'BLESSED_EXTENSION') {
       chrome.extension.onRequestExternal.addListener = function() {
         throw new Error(sendRequestIsDisabled);
       };
     }
   }
 
 });