gpu: Move GpuWatchdogThread into //gpu/ipc/service from content.

gpu/ipc/service/gpu_command_buffer_stub.h

 // Copyright (c) 2012 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 GPU_IPC_SERVICE_GPU_COMMAND_BUFFER_STUB_H_
 #define GPU_IPC_SERVICE_GPU_COMMAND_BUFFER_STUB_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 35 matching lines @@
 }
 }
 
 struct GPUCreateCommandBufferConfig;
 struct GpuCommandBufferMsg_CreateImage_Params;
 struct GpuCommandBufferMsg_SwapBuffersCompleted_Params;
 
 namespace gpu {
 
 class GpuChannel;
-class GpuWatchdog;
+class GpuWatchdogThread;
 struct WaitForCommandState;
 
 class GPU_EXPORT GpuCommandBufferStub
     : public IPC::Listener,
       public IPC::Sender,
       public base::SupportsWeakPtr<GpuCommandBufferStub> {
  public:
   class DestructionObserver {
    public:
     // Called in Destroy(), before the context/surface are released.
@@ skipping 183 matching lines @@
 
   std::unique_ptr<WaitForCommandState> wait_for_token_;
   std::unique_ptr<WaitForCommandState> wait_for_get_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_GPU_COMMAND_BUFFER_STUB_H_