[DevTools] Cleanup DevToolsTarget and DevToolsManagerDelegate after moving to devtools_discovery.

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 "components/devtools_http_handler/devtools_http_handler_delegate.h"
-#include "content/public/browser/devtools_manager_delegate.h"
 #include "net/socket/stream_listen_socket.h"
 
-namespace base {
-class FilePath;
-}
-
-namespace content {
-class BrowserContext;
-}
-
 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;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CastDevToolsDelegate);
 };
 
-class CastDevToolsManagerDelegate : public content::DevToolsManagerDelegate {
- public:
-  CastDevToolsManagerDelegate();
-  ~CastDevToolsManagerDelegate() override;
-
-  // DevToolsManagerDelegate implementation.
-  void Inspect(
-      content::BrowserContext* browser_context,
-      content::DevToolsAgentHost* agent_host) override {}
-  void DevToolsAgentStateChanged(
-      content::DevToolsAgentHost* agent_host,
-      bool attached) override {}
-  base::DictionaryValue* HandleCommand(
-      content::DevToolsAgentHost* agent_host,
-      base::DictionaryValue* command) override;
-  scoped_ptr<content::DevToolsTarget> CreateNewTarget(const GURL& url) override;
-  void EnumerateTargets(TargetCallback callback) override;
-  std::string GetPageThumbnailData(const GURL& url) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CastDevToolsManagerDelegate);
-};
-
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_DEVTOOLS_CAST_DEV_TOOLS_DELEGATE_H_