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

ui/gfx/frame_time.h

Index: ui/gfx/frame_time.h
diff --git a/ui/gfx/frame_time.h b/ui/gfx/frame_time.h
index d5eb1cb6172d07c746b1b9182734a7230f0f06b1..14e85910be77168882fdafcb767772ca5267290b 100644
--- a/ui/gfx/frame_time.h
+++ b/ui/gfx/frame_time.h
@@ -18,13 +18,6 @@ class FrameTime {
     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