DevTools: simplify http handler delegate as it is moving into content.

chromecast/browser/devtools/cast_dev_tools_delegate.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 CHROMECAST_BROWSER_DEVTOOLS_CAST_DEV_TOOLS_DELEGATE_H_
 #define CHROMECAST_BROWSER_DEVTOOLS_CAST_DEV_TOOLS_DELEGATE_H_
 
 #include "base/macros.h"
 #include "components/devtools_http_handler/devtools_http_handler_delegate.h"
 
 namespace chromecast {
 namespace shell {
 
 class CastDevToolsDelegate :
     public devtools_http_handler::DevToolsHttpHandlerDelegate {
  public:
   CastDevToolsDelegate();
   ~CastDevToolsDelegate() override;
 
   // devtools_http_handler::DevToolsHttpHandlerDelegate implementation.
   std::string GetDiscoveryPageHTML() override;
   std::string GetFrontendResource(const std::string& path) override;
-  std::string GetPageThumbnailData(const GURL& url) override;
-  content::DevToolsExternalAgentProxyDelegate*
-      HandleWebSocketConnection(const std::string& path) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CastDevToolsDelegate);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_DEVTOOLS_CAST_DEV_TOOLS_DELEGATE_H_