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

content/shell/browser/shell_devtools_manager_delegate.h

 // Copyright 2013 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 CONTENT_SHELL_BROWSER_SHELL_DEVTOOLS_MANAGER_DELEGATE_H_
 #define CONTENT_SHELL_BROWSER_SHELL_DEVTOOLS_MANAGER_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "components/devtools_http_handler/devtools_http_handler_delegate.h"
@@ skipping 15 matching lines @@
   explicit ShellDevToolsManagerDelegate(BrowserContext* browser_context);
   ~ShellDevToolsManagerDelegate() override;
 
   // DevToolsManagerDelegate implementation.
   void Inspect(BrowserContext* browser_context,
                DevToolsAgentHost* agent_host) override {}
   void DevToolsAgentStateChanged(DevToolsAgentHost* agent_host,
                                  bool attached) override {}
   base::DictionaryValue* HandleCommand(DevToolsAgentHost* agent_host,
                                        base::DictionaryValue* command) override;
-  scoped_ptr<DevToolsTarget> CreateNewTarget(const GURL& url) override;
-  void EnumerateTargets(TargetCallback callback) override;
-  std::string GetPageThumbnailData(const GURL& url) override;
 
  private:
   BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDevToolsManagerDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_DEVTOOLS_MANAGER_DELEGATE_H_