[Android] Use resource throttle instead of HandleExternalProtocol.

android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_LIB_RENDERER_HOST_AW_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #define ANDROID_WEBVIEW_LIB_RENDERER_HOST_AW_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 
 #include "base/lazy_instance.h"
@@ skipping 20 matching lines @@
       bool is_continuation_of_transferred_request,
       ScopedVector<content::ResourceThrottle>* throttles) OVERRIDE;
 
   virtual bool AcceptAuthRequest(net::URLRequest* request,
                                  net::AuthChallengeInfo* auth_info) OVERRIDE;
 
   virtual content::ResourceDispatcherHostLoginDelegate* CreateLoginDelegate(
       net::AuthChallengeInfo* auth_info,
       net::URLRequest* request) OVERRIDE;
 
-  virtual void HandleExternalProtocol(const GURL& url,
+  virtual bool HandleExternalProtocol(const GURL& url,
                                       int child_id,
                                       int route_id) OVERRIDE;
 
  private:
   friend struct base::DefaultLazyInstanceTraits<
       AwResourceDispatcherHostDelegate>;
   AwResourceDispatcherHostDelegate();
   virtual ~AwResourceDispatcherHostDelegate();
   void SetOnlyAllowLoadFromCache(net::URLRequest* request);
 
   DISALLOW_COPY_AND_ASSIGN(AwResourceDispatcherHostDelegate);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_LIB_RENDERER_HOST_AW_RESOURCE_DISPATCHER_HOST_H_