Revert of GPU Watchdog to check I/O before terminating GPU process

content/gpu/gpu_watchdog_thread.h

Index: content/gpu/gpu_watchdog_thread.h
diff --git a/content/gpu/gpu_watchdog_thread.h b/content/gpu/gpu_watchdog_thread.h
index 56b2db83abb24d90bad9fcf3b0def728f3bf99c0..68d3cd8cb8d7c9b6574e69fa21f21d418b311b5a 100644
--- a/content/gpu/gpu_watchdog_thread.h
+++ b/content/gpu/gpu_watchdog_thread.h
@@ -5,7 +5,6 @@
 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 
-#include "base/files/file.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ -75,7 +74,6 @@
 
   void OnAcknowledge();
   void OnCheck(bool after_suspend);
-  void BeginTerminating();
   void DeliberatelyTerminateToRecoverFromHang();
 #if defined(USE_X11)
   void SetupXServer();
@@ -133,14 +131,6 @@
   base::Time check_time_;
   base::TimeTicks check_timeticks_;
 
-#if defined(OS_WIN)
-  // Writing to this temp file is used as an additional step before crashing the
-  // process. That should help to distinguish true hangs from the cases when the
-  // watched thread is running slow being blocked on hard faults or other I/O.
-  base::File temp_file_for_io_checking_;
-  base::TimeDelta io_check_duration_;
-#endif
-
 #if defined(USE_X11)
   XDisplay* display_;
   gfx::AcceleratedWidget window_;