Extract minimal RenderViewHost interface for embedders, leaving

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index 27240638782c70c2b5a6dd7fc9b272eb7af9837b..9df981051dba5289404ffb3974608f5bf75ae1cd 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -582,7 +582,7 @@ RenderWidgetHostViewGtk::RenderWidgetHostViewGtk(RenderWidgetHost* widget_host)
       dragged_at_vertical_edge_(0),
       compositing_surface_(gfx::kNullPluginWindow),
       last_mouse_down_(NULL) {
-  host_ = static_cast<RenderWidgetHostImpl*>(widget_host);
+  host_ = widget_host->AsRWHImpl();
   host_->SetView(this);
 }
 
@@ -1035,7 +1035,7 @@ void RenderWidgetHostViewGtk::AcceleratedSurfaceSuspend() {
 
 void RenderWidgetHostViewGtk::SetBackground(const SkBitmap& background) {
   content::RenderWidgetHostViewBase::SetBackground(background);
-  host_->Send(new ViewMsg_SetBackground(host_->routing_id(), background));
+  host_->Send(new ViewMsg_SetBackground(host_->GetRoutingID(), background));
 }
 
 void RenderWidgetHostViewGtk::ModifyEventForEdgeDragging(
@@ -1096,8 +1096,7 @@ void RenderWidgetHostViewGtk::Paint(const gfx::Rect& damage_rect) {
 
   // If the GPU process is rendering directly into the View,
   // call the compositor directly.
-  RenderWidgetHostImpl* render_widget_host =
-      static_cast<RenderWidgetHostImpl*>(GetRenderWidgetHost());
+  RenderWidgetHostImpl* render_widget_host = GetRenderWidgetHost()->AsRWHImpl();
   if (render_widget_host->is_accelerated_compositing_active()) {
     host_->ScheduleComposite();
     return;
@@ -1315,7 +1314,7 @@ void RenderWidgetHostViewGtk::ForwardKeyboardEvent(
   if (!event.skip_in_browser &&
       key_bindings_handler_->Match(event, &edit_commands)) {
     host_->Send(new ViewMsg_SetEditCommandsForNextKeyEvent(
-        host_->routing_id(), edit_commands));
+        host_->GetRoutingID(), edit_commands));
     NativeWebKeyboardEvent copy_event(event);
     copy_event.match_edit_command = true;
     host_->ForwardKeyboardEvent(copy_event);