ui: Cleanup class/struct forward declarations

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 2335a60fa9e27504129300f8935b3a8e6eef7961..925ca787cc2d5b7a76e8d779c0a422158e38991f 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -341,12 +341,6 @@ void RenderWidgetHostImpl::SetView(RenderWidgetHostViewBase* view) {
     view_.reset();
   }
 
-  // If the renderer has not yet been initialized, then the surface ID
-  // namespace will be sent during initialization.
-  if (view_ && renderer_initialized_) {
-    Send(new ViewMsg_SetFrameSinkId(routing_id_, view_->GetFrameSinkId()));
-  }
-
   synthetic_gesture_controller_.reset();
 }
 
@@ -413,12 +407,6 @@ void RenderWidgetHostImpl::Init() {
 
   renderer_initialized_ = true;
 
-  // If the RWHV has not yet been set, the surface ID namespace will get
-  // passed down by the call to SetView().
-  if (view_) {
-    Send(new ViewMsg_SetFrameSinkId(routing_id_, view_->GetFrameSinkId()));
-  }
-
   SendScreenRects();
   WasResized();
 
@@ -1906,12 +1894,16 @@ void RenderWidgetHostImpl::IncrementInFlightEventCount(
   }
 }
 
-void RenderWidgetHostImpl::DecrementInFlightEventCount() {
+void RenderWidgetHostImpl::DecrementInFlightEventCount(
+    InputEventAckSource ack_source) {
   if (decrement_in_flight_event_count() <= 0) {
     // Cancel pending hung renderer checks since the renderer is responsive.
     StopHangMonitorTimeout();
   } else {
-    RestartHangMonitorTimeoutIfNecessary();
+    // Only restart the hang monitor timer if we got a response from the
+    // main thread.
+    if (ack_source == InputEventAckSource::MAIN_THREAD)
+      RestartHangMonitorTimeoutIfNecessary();
   }
 }