Clean up logging for debugging RAF related flakiness in WebGL conformance tests.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index d82a99cfebfc5e4e90c4076191d1cb80f1e95e4d..57f0ca05b23ac92f22a2fd7bdd43c554f2601027 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -770,7 +770,6 @@ void RenderWidgetCompositor::DidBeginMainFrame() {
 }
 
 void RenderWidgetCompositor::BeginMainFrame(const cc::BeginFrameArgs& args) {
-  VLOG(2) << "RenderWidgetCompositor::BeginMainFrame";
   begin_main_frame_time_ = args.frame_time;
   begin_main_frame_interval_ = args.interval;
   double frame_time_sec = (args.frame_time - base::TimeTicks()).InSecondsF();