DevTools: remove DevToolsTargetDescriptor and its implementations, we are now based on devtools age…

components/devtools_discovery/devtools_target_descriptor.h

-// Copyright 2015 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 COMPONENTS_DEVTOOLS_DISCOVERY_DEVTOOLS_TARGET_DESCRIPTOR_H_
-#define COMPONENTS_DEVTOOLS_DISCOVERY_DEVTOOLS_TARGET_DESCRIPTOR_H_
-
-#include <string>
-#include <vector>
-
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-#include "url/gurl.h"
-
-namespace content {
-class DevToolsAgentHost;
-}
-
-namespace devtools_discovery {
-
-// DevToolsTargetDescriptor provides information about devtools target
-// and can be used to manipulate the target and query its details.
-// Instantiation and discovery of DevToolsTargetDescriptor instances
-// is the responsibility of DevToolsDiscoveryManager.
-class DevToolsTargetDescriptor {
- public:
-  using List = std::vector<DevToolsTargetDescriptor*>;
-  virtual ~DevToolsTargetDescriptor() {}
-
-  // Returns the agent host for this target.
-  virtual scoped_refptr<content::DevToolsAgentHost> GetAgentHost() const = 0;
-};
-
-}  // namespace devtools_discovery
-
-#endif  // COMPONENTS_DEVTOOLS_DISCOVERY_DEVTOOLS_TARGET_DESCRIPTOR_H_