Remove gfx::FrameTime for a single clock source

A single clock source should be used through out the code.
This patch removes the gfx::FrameTime clock and uses the base::TimeTicks
overall.

BUG=447329
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1143433005

Cr-Commit-Position: refs/heads/master@{#331327}
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index aaa8708..e40abffc 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -31,7 +31,6 @@
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animator_collection.h"
-#include "ui/gfx/frame_time.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_switches.h"
 
@@ -390,7 +389,7 @@
 }
 
 void Compositor::DidPostSwapBuffers() {
-  base::TimeTicks start_time = gfx::FrameTime::Now();
+  base::TimeTicks start_time = base::TimeTicks::Now();
   FOR_EACH_OBSERVER(CompositorObserver, observer_list_,
                     OnCompositingStarted(this, start_time));
 }