Move ViewHostMsg_CreateFullscreenWidget to mojom.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 46e17ef148142e3abfd6ed58740f89d8aecf7d1b..624e3bddbbc95e3550d03e088b21f17f8be598e2 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -120,7 +120,6 @@ class CONTENT_EXPORT RenderMessageFilter
   friend class base::DeleteHelper<RenderMessageFilter>;
 
   void OnGetProcessMemorySizes(size_t* private_bytes, size_t* shared_bytes);
-  void OnCreateFullscreenWidget(int opener_id, int* route_id);
 
 #if defined(OS_MACOSX)
   // Messages for OOP font loading.
@@ -135,6 +134,9 @@ class CONTENT_EXPORT RenderMessageFilter
   void CreateNewWidget(int32_t opener_id,
                        blink::WebPopupType popup_type,
                        const CreateNewWidgetCallback& callback) override;
+  void CreateFullscreenWidget(
+      int opener_id,
+      const CreateFullscreenWidgetCallback& callback) override;
 
   // Message handlers called on the browser IO thread:
   void OnEstablishGpuChannel(IPC::Message* reply);