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

gpu/ipc/service/gpu_watchdog.h

Index: gpu/ipc/service/gpu_watchdog.h
diff --git a/gpu/ipc/service/gpu_watchdog.h b/gpu/ipc/service/gpu_watchdog.h
deleted file mode 100644
index 41f173279d18cf44be6e5d415c1e4e233d863139..0000000000000000000000000000000000000000
--- a/gpu/ipc/service/gpu_watchdog.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// 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_WATCHDOG_H_
-#define GPU_IPC_SERVICE_GPU_WATCHDOG_H_
-
-#include "base/macros.h"
-
-namespace gpu {
-
-// Interface for objects that monitor the a GPUProcessor's progress. The
-// GPUProcessor will regularly invoke CheckArmed.
-class GpuWatchdog {
- public:
-  virtual void CheckArmed() = 0;
-
- protected:
-  GpuWatchdog() {}
-  virtual ~GpuWatchdog() {};
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(GpuWatchdog);
-};
-
-}  // namespace gpu
-
-#endif  // GPU_IPC_SERVICE_GPU_WATCHDOG_H_