blimp: Cleanup class/struct forward declarations

blimp/engine/session/blimp_engine_session.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 BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_
 #define BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 35 matching lines @@
 namespace net {
 class NetLog;
 }
 
 namespace wm {
 class FocusController;
 }
 
 namespace blimp {
 
-class BlimpConnection;
 class BlimpMessage;
-class BlimpMessageThreadPipe;
-class BlobCache;
 class HeliumBlobSenderDelegate;
 class ThreadPipeManager;
 class SettingsManager;
 
 namespace engine {
 
 class BlimpBrowserContext;
 class BlimpEngineConfig;
-class BlimpFocusClient;
 class BlimpScreen;
 class BlimpWindowTreeHost;
 class EngineNetworkComponents;
 class Tab;
 
 class BlimpEngineSession : public BlimpMessageProcessor,
                            public content::WebContentsDelegate,
                            public ui::InputMethodObserver {
  public:
   using GetPortCallback = base::Callback<void(uint16_t)>;
@@ skipping 141 matching lines @@
   // TODO(haibinlu): Support more than one tab (crbug/547231)
   std::unique_ptr<Tab> tab_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpEngineSession);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_