Move NativeWebKeyboardEvent to the content namespace.

chrome/browser/ui/panels/panel_browser_window_gtk.h

Index: chrome/browser/ui/panels/panel_browser_window_gtk.h
===================================================================
--- chrome/browser/ui/panels/panel_browser_window_gtk.h	(revision 137859)
+++ chrome/browser/ui/panels/panel_browser_window_gtk.h	(working copy)
@@ -100,10 +100,10 @@
   virtual void DrawAttention(bool draw_attention) OVERRIDE;
   virtual bool IsDrawingAttention() const OVERRIDE;
   virtual bool PreHandlePanelKeyboardEvent(
-      const NativeWebKeyboardEvent& event,
+      const content::NativeWebKeyboardEvent& event,
       bool* is_keyboard_shortcut) OVERRIDE;
   virtual void HandlePanelKeyboardEvent(
-      const NativeWebKeyboardEvent& event) OVERRIDE;
+      const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual void FullScreenModeChanged(bool is_full_screen) OVERRIDE;
   virtual Browser* GetPanelBrowser() const OVERRIDE;
   virtual void DestroyPanelBrowser() OVERRIDE;