DevTools: merge devtools_http_handler into content - it is used in all the embedders anyways.

chrome/browser/devtools/chrome_devtools_manager_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 CHROME_BROWSER_DEVTOOLS_CHROME_DEVTOOLS_MANAGER_DELEGATE_H_
 #define CHROME_BROWSER_DEVTOOLS_CHROME_DEVTOOLS_MANAGER_DELEGATE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
   void Inspect(content::DevToolsAgentHost* agent_host) override;
   void DevToolsAgentStateChanged(content::DevToolsAgentHost* agent_host,
                                  bool attached) override;
   base::DictionaryValue* HandleCommand(
       content::DevToolsAgentHost* agent_host,
       base::DictionaryValue* command_dict) override;
   std::string GetTargetType(content::RenderFrameHost* host) override;
   std::string GetTargetTitle(content::RenderFrameHost* host) override;
   scoped_refptr<content::DevToolsAgentHost> CreateNewTarget(
       const GURL& url) override;
+  std::string GetDiscoveryPageHTML() override;
+  std::string GetFrontendResource(const std::string& path) override;
 
  private:
   std::unique_ptr<DevToolsNetworkProtocolHandler> network_protocol_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeDevToolsManagerDelegate);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_CHROME_DEVTOOLS_MANAGER_DELEGATE_H_