chrome: Cleanup class/struct forward declarations

chrome/browser/devtools/device/devtools_android_bridge.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 CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_ANDROID_BRIDGE_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_ANDROID_BRIDGE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/devtools/device/android_device_manager.h"
 #include "chrome/browser/devtools/device/devtools_device_discovery.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace base {
 template<typename T> struct DefaultSingletonTraits;
-
-class MessageLoop;
-class DictionaryValue;
-class ListValue;
-class Thread;
 }  // namespace base
 
 namespace content {
 class BrowserContext;
 }
 
 class PortForwardingController;
 class Profile;
 class TCPDeviceProvider;
 
@@ skipping 147 matching lines @@
   TCPProviderCallback tcp_provider_callback_;
 
   std::unique_ptr<DevToolsDeviceDiscovery> device_discovery_;
 
   base::WeakPtrFactory<DevToolsAndroidBridge> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsAndroidBridge);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_ANDROID_BRIDGE_H_