Extract NativeAppWindow from src/extensions

extensions/browser/app_window/app_window_contents.h

Index: extensions/browser/app_window/app_window_contents.h
diff --git a/extensions/browser/app_window/app_window_contents.h b/extensions/browser/app_window/app_window_contents.h
index 2a3d905beca08fcce0d0a56774394f7feaa85d12..b9e6fce0862c4c7ab92f189030b6f47f3ca9765a 100644
--- a/extensions/browser/app_window/app_window_contents.h
+++ b/extensions/browser/app_window/app_window_contents.h
@@ -19,8 +19,6 @@ class BrowserContext;
 
 namespace extensions {
 
-struct DraggableRegion;
-
 // AppWindowContents class specific to app windows. It maintains a
 // WebContents instance and observes it for the purpose of passing
 // messages to the extensions system.
@@ -35,7 +33,8 @@ class AppWindowContentsImpl : public AppWindowContents,
   virtual void Initialize(content::BrowserContext* context,
                           const GURL& url) OVERRIDE;
   virtual void LoadContents(int32 creator_process_id) OVERRIDE;
-  virtual void NativeWindowChanged(NativeAppWindow* native_app_window) OVERRIDE;
+  virtual void NativeWindowChanged(
+      native_app_window::NativeAppWindow* native_app_window) OVERRIDE;
   virtual void NativeWindowClosed() OVERRIDE;
   virtual void DispatchWindowShownForTests() const OVERRIDE;
   virtual content::WebContents* GetWebContents() const OVERRIDE;
@@ -49,7 +48,8 @@ class AppWindowContentsImpl : public AppWindowContents,
   virtual content::WebContents* GetAssociatedWebContents() const OVERRIDE;
 
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
-  void UpdateDraggableRegions(const std::vector<DraggableRegion>& regions);
+  void UpdateDraggableRegions(
+      const std::vector<native_app_window::DraggableRegion>& regions);
   void SuspendRenderViewHost(content::RenderViewHost* rvh);
 
   AppWindow* host_;  // This class is owned by |host_|