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

content/public/browser/devtools_target.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_PUBLIC_BROWSER_DEVTOOLS_TARGET_H_
-#define CONTENT_PUBLIC_BROWSER_DEVTOOLS_TARGET_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-#include "content/common/content_export.h"
-#include "url/gurl.h"
-
-namespace content {
-
-class DevToolsAgentHost;
-
-// DevToolsTarget represents an inspectable target and can be used to
-// manipulate the target and query its details.
-// Instantiation and discovery of DevToolsTarget instances is the responsibility
-// of DevToolsHttpHandlerDelegate.
-class DevToolsTarget {
- public:
-  virtual ~DevToolsTarget() {}
-
-  // Returns the unique target id.
-  virtual std::string GetId() const = 0;
-
-  // Returns the id of the parent target, or empty string if no parent.
-  virtual std::string GetParentId() const = 0;
-
-  // Returns the target type.
-  virtual std::string GetType() const = 0;
-
-  // Returns the target title.
-  virtual std::string GetTitle() const = 0;
-
-  // Returns the target description.
-  virtual std::string GetDescription() const = 0;
-
-  // Returns the url associated with this target.
-  virtual GURL GetURL() const = 0;
-
-  // Returns the favicon url for this target.
-  virtual GURL GetFaviconURL() const = 0;
-
-  // Returns the time when the target was last active.
-  virtual base::TimeTicks GetLastActivityTime() const = 0;
-
-  // Returns true if the debugger is attached to the target.
-  virtual bool IsAttached() const = 0;
-
-  // Returns the agent host for this target.
-  virtual scoped_refptr<DevToolsAgentHost> GetAgentHost() const = 0;
-
-  // Activates the target. Returns false if the operation failed.
-  virtual bool Activate() const = 0;
-
-  // Closes the target. Returns false if the operation failed.
-  virtual bool Close() const = 0;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_TARGET_H_