Remove windows/mac/ios specific code from //ui

ui/gfx/frame_time.h

 // Copyright 2013 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 UI_GFX_FRAME_TIME_H
 #define UI_GFX_FRAME_TIME_H
 
 #include "base/time/time.h"
 #include "base/logging.h"
 
 namespace gfx {
 
 // FrameTime::Now() should be used to get timestamps with a timebase that
 // is consistent across the graphics stack.
 class FrameTime {
  public:
   static base::TimeTicks Now() {
     return base::TimeTicks::Now();
   }
 
-#if defined(OS_WIN)
-  static base::TimeTicks FromQPCValue(LONGLONG qpc_value) {
-    DCHECK(TimestampsAreHighRes());
-    return base::TimeTicks::FromQPCValue(qpc_value);
-  }
-#endif
-
   static bool TimestampsAreHighRes() {
     // This should really return base::TimeTicks::IsHighResNowFastAndReliable();
     // Returning false makes sure we are only using low-res timestamps until we
     // use FrameTime everywhere we need to. See crbug.com/315334
     return false;
   }
 };
 
 }
 
 #endif // UI_GFX_FRAME_TIME_H