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

content/public/browser/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 CONTENT_PUBLIC_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_
 
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-
 namespace base {
 class DictionaryValue;
 }
 
-class GURL;
-
 namespace content {
 
 class BrowserContext;
 class DevToolsAgentHost;
-class DevToolsTarget;
 
 class DevToolsManagerDelegate {
  public:
   virtual ~DevToolsManagerDelegate() {}
 
   // Opens the inspector for |agent_host|.
   virtual void Inspect(BrowserContext* browser_context,
                        DevToolsAgentHost* agent_host) = 0;
 
   virtual void DevToolsAgentStateChanged(DevToolsAgentHost* agent_host,
                                          bool attached) = 0;
 
   // Result ownership is passed to the caller.
   virtual base::DictionaryValue* HandleCommand(
       DevToolsAgentHost* agent_host,
       base::DictionaryValue* command) = 0;
-
-  // Creates new inspectable target.
-  virtual scoped_ptr<DevToolsTarget> CreateNewTarget(const GURL& url) = 0;
-
-  typedef std::vector<DevToolsTarget*> TargetList;
-  typedef base::Callback<void(const TargetList&)> TargetCallback;
-
-  // Requests the list of all inspectable targets.
-  // The caller gets the ownership of the returned targets.
-  virtual void EnumerateTargets(TargetCallback callback) = 0;
-
-  // Get a thumbnail for a given page. Returns non-empty string iff we have the
-  // thumbnail.
-  virtual std::string GetPageThumbnailData(const GURL& url) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_