Add WebNavigatorConnectCallbacks typedef.

public/platform/WebNavigatorConnectProvider.h

 // 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.
 
 #ifndef WebNavigatorConnectProvider_h
 #define WebNavigatorConnectProvider_h
 
 #include "WebCallbacks.h"
 
 namespace blink {
 
 class WebMessagePortChannel;
 class WebString;
 class WebURL;
 
+typedef WebCallbacks<void, void> WebNavigatorConnectCallbacks;
+
 class WebNavigatorConnectProvider {
 public:
     virtual ~WebNavigatorConnectProvider() { }
 
     // Initiates a connection from the given origin to the given URL. When
     // successful the service can communicate with the client over the given
     // channel. The origin isn't passed as WebSecurityOrigin because that would
     // be a layering violation (platform/ code shouldn't depend on web/ code).
-    // Ownership of the WebMessagePortChannel and WebCallbacks is transferred to the provider.
-    virtual void connect(const WebURL&, const WebString& origin, WebMessagePortChannel*, WebCallbacks<void, void>*) { }
+    // Ownership of the WebMessagePortChannel and WebNavigatorConnectCallbacks
+    // objects are both transferred to the provider.
+    virtual void connect(const WebURL&, const WebString& origin, WebMessagePortChannel*, WebNavigatorConnectCallbacks*) { }
 };
 
 } // namespace blink
 
 #endif // WebNavigatorConnectProvider_h