Move ExtensionWindowController and related into extensions namespace

chrome/browser/ui/panels/panel_host.h

Index: chrome/browser/ui/panels/panel_host.h
diff --git a/chrome/browser/ui/panels/panel_host.h b/chrome/browser/ui/panels/panel_host.h
index 4fab89688f7d60b2347d269a4b2a0db8d5fb79c1..e54017f77e3895c587da742340a3a9e761b32303 100644
--- a/chrome/browser/ui/panels/panel_host.h
+++ b/chrome/browser/ui/panels/panel_host.h
@@ -12,7 +12,6 @@
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/page_zoom.h"
 
-class ExtensionWindowController;
 class FaviconTabHelper;
 class GURL;
 class Panel;
@@ -22,6 +21,10 @@ namespace content {
 class WebContents;
 }
 
+namespace extensions {
+class WindowController;
+}
+
 namespace gfx {
 class Rect;
 }
@@ -69,7 +72,7 @@ class PanelHost : public content::WebContentsDelegate,
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // ExtensionFunctionDispatcher::Delegate overrides.
-  virtual ExtensionWindowController* GetExtensionWindowController() const
+  virtual extensions::WindowController* GetExtensionWindowController() const
       OVERRIDE;
   virtual content::WebContents* GetAssociatedWebContents() const OVERRIDE;