Replaces instances of the deprecated TimeTicks::HighResNow() with TimeTicks::Now().

cc/scheduler/delay_based_time_source.h

Index: cc/scheduler/delay_based_time_source.h
diff --git a/cc/scheduler/delay_based_time_source.h b/cc/scheduler/delay_based_time_source.h
index 9f670d1f8ff05e77eaad4b9c54b4a6d55fc3cfcd..460bfa46dcc1bab0dd001ad762a253cae7d91255 100644
--- a/cc/scheduler/delay_based_time_source.h
+++ b/cc/scheduler/delay_based_time_source.h
@@ -95,7 +95,7 @@ class CC_EXPORT DelayBasedTimeSource
   DISALLOW_COPY_AND_ASSIGN(DelayBasedTimeSource);
 };
 
-// DelayBasedTimeSource uses base::TimeTicks::HighResNow as its timebase.
+// DelayBasedTimeSource uses base::TimeTicks::Now as its timebase.

[miu, 2015/01/21 23:52:51]

This change has caused a weird situation.  The behavior of this class is now
equivalent to DelayBasedTimeSource (declared above).  I would change this
comment to:

// DelayBasedTimeSource that once used base::TimeTicks::HighResNow as its
// time source, but is now a no-op.
// TODO(brianderson): Remove along with gfx::FrameTime.  http://crbug.com/447329

[charliea_google.com, 2015/01/22 15:20:45]

Done.

 class DelayBasedTimeSourceHighRes : public DelayBasedTimeSource {
  public:
   static scoped_refptr<DelayBasedTimeSourceHighRes> Create(