Remove browser-side tracking of accelerated compositing

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 1e7aea7cc35c1fc713df9f5c4199600d2ed06a13..3a39f6040cfd57f53cf3290bbbebabee32a87c69 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1176,8 +1176,6 @@ void RenderWidget::didActivateCompositor() {
   TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");
 
   is_accelerated_compositing_active_ = true;
-  Send(new ViewHostMsg_DidActivateAcceleratedCompositing(
-      routing_id_, is_accelerated_compositing_active_));
   webwidget_->enterForceCompositingMode(true);
 }
 
@@ -1185,8 +1183,6 @@ void RenderWidget::didDeactivateCompositor() {
   TRACE_EVENT0("gpu", "RenderWidget::didDeactivateCompositor");
 
   is_accelerated_compositing_active_ = false;
-  Send(new ViewHostMsg_DidActivateAcceleratedCompositing(
-      routing_id_, is_accelerated_compositing_active_));
 }
 
 void RenderWidget::initializeLayerTreeView() {