Revert of Read compositor VSync information from platform, when possible

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 7061599e8e9f742c959589c65613c7fc819b2182..e66253335408f8721adfd8d3682293fe1af342ca 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -27,7 +27,6 @@
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_switches.h"
-#include "ui/compositor/compositor_vsync_manager.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/frame_time.h"
@@ -184,7 +183,6 @@
 Compositor::Compositor(gfx::AcceleratedWidget widget)
     : root_layer_(NULL),
       widget_(widget),
-      vsync_manager_(new CompositorVSyncManager()),
       posted_swaps_(new PostedSwapQueue()),
       device_scale_factor_(0.0f),
       last_started_frame_(0),
@@ -422,10 +420,6 @@
   ScheduleDraw();
 }
 
-scoped_refptr<CompositorVSyncManager> Compositor::vsync_manager() const {
-  return vsync_manager_;
-}
-
 void Compositor::AddObserver(CompositorObserver* observer) {
   observer_list_.AddObserver(observer);
 }
@@ -436,6 +430,13 @@
 
 bool Compositor::HasObserver(CompositorObserver* observer) {
   return observer_list_.HasObserver(observer);
+}
+
+void Compositor::OnUpdateVSyncParameters(base::TimeTicks timebase,
+                                         base::TimeDelta interval) {
+  FOR_EACH_OBSERVER(CompositorObserver,
+                    observer_list_,
+                    OnUpdateVSyncParameters(this, timebase, interval));
 }
 
 void Compositor::Layout() {