RenderWidget: make routing_id be a parameter of the ctor

content/renderer/render_widget_fullscreen.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_fullscreen.h"
 
 #include "content/common/view_messages.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/public/web/WebWidget.h"
 
 using blink::WebWidget;
 
 namespace content {
 
 void RenderWidgetFullscreen::show(blink::WebNavigationPolicy) {
   DCHECK(!did_show_) << "received extraneous Show call";
   DCHECK_NE(MSG_ROUTING_NONE, routing_id());
   DCHECK_NE(MSG_ROUTING_NONE, opener_id_);
 
   if (!did_show_) {
     did_show_ = true;
     Send(new ViewHostMsg_ShowFullscreenWidget(opener_id_, routing_id()));
     SetPendingWindowRect(initial_rect_);
   }
 }
 
 RenderWidgetFullscreen::RenderWidgetFullscreen(
+    int32_t widget_routing_id,
     CompositorDependencies* compositor_deps,
     const ScreenInfo& screen_info)
-    : RenderWidget(compositor_deps,
+    : RenderWidget(widget_routing_id,
+                   compositor_deps,
                    blink::WebPopupTypeNone,
                    screen_info,
                    false,
                    false,
                    false) {}
 
 RenderWidgetFullscreen::~RenderWidgetFullscreen() {}
 
 WebWidget* RenderWidgetFullscreen::CreateWebWidget() {
   // TODO(boliu): Handle full screen render widgets here.
   return RenderWidget::CreateWebWidget(this);
 }
 
 bool RenderWidgetFullscreen::Init(int32_t opener_id) {
   DCHECK(!GetWebWidget());
 
-  // Synchronous IPC to obtain a routing id for ourselves.
-  int32_t routing_id = MSG_ROUTING_NONE;
-  if (!RenderThreadImpl::current_render_message_filter()
-           ->CreateFullscreenWidget(opener_id, &routing_id)) {
-    return false;
-  }
-
-  RenderWidget::InitRoutingID(routing_id);
   RenderWidget::Init(opener_id, CreateWebWidget());
   return true;
 }
 
 }  // namespace content