Remove dead paint flush tracking code.

content/renderer/render_widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 757 matching lines @@
     observer.DidCommitCompositorFrame();
   for (auto& observer : render_frame_proxies_)
     observer.DidCommitCompositorFrame();
 }
 
 void RenderWidget::DidCompletePageScaleAnimation() {}
 
 void RenderWidget::DidReceiveCompositorFrameAck() {
   TRACE_EVENT0("renderer", "RenderWidget::DidReceiveCompositorFrameAck");
 
-  // Notify subclasses threaded composited rendering was flushed to the screen.
-  DidFlushPaint();
-
   if (!next_paint_flags_ && !need_update_rect_for_auto_resize_) {
     return;
   }
 
   ViewHostMsg_UpdateRect_Params params;
   params.view_size = size_;
   params.flags = next_paint_flags_;
 
   Send(new ViewHostMsg_UpdateRect(routing_id_, params));
   next_paint_flags_ = 0;
@@ skipping 893 matching lines @@
 
   if (owner_delegate_)
     owner_delegate_->RenderWidgetDidSetColorProfile(color_profile);
 
   return true;
 }
 
 void RenderWidget::OnOrientationChange() {
 }
 
-void RenderWidget::DidFlushPaint() {
-  if (owner_delegate_)
-    owner_delegate_->RenderWidgetDidFlushPaint();
-}
-
 void RenderWidget::SetHidden(bool hidden) {
   if (is_hidden_ == hidden)
     return;
 
   // The status has changed.  Tell the RenderThread about it and ensure
   // throttled acks are released in case frame production ceases.
   is_hidden_ = hidden;
 
   if (is_hidden_)
     RenderThreadImpl::current()->WidgetHidden();
@@ skipping 388 matching lines @@
 bool RenderWidget::isPointerLocked() {
   return mouse_lock_dispatcher_->IsMouseLockedTo(
       webwidget_mouse_lock_target_.get());
 }
 
 blink::WebWidget* RenderWidget::GetWebWidget() const {
   return webwidget_internal_;
 }
 
 }  // namespace content