Move ExtensionHost into extensions namespace

chrome/browser/ui/gtk/extensions/extension_popup_gtk.h

Index: chrome/browser/ui/gtk/extensions/extension_popup_gtk.h
diff --git a/chrome/browser/ui/gtk/extensions/extension_popup_gtk.h b/chrome/browser/ui/gtk/extensions/extension_popup_gtk.h
index f6d05d16e69d2da201945630c5d68f9e87772ce0..ef1e74c39f9c68162606a365f2e0b2f145e8de0c 100644
--- a/chrome/browser/ui/gtk/extensions/extension_popup_gtk.h
+++ b/chrome/browser/ui/gtk/extensions/extension_popup_gtk.h
@@ -15,9 +15,12 @@
 #include "ui/gfx/rect.h"
 
 class Browser;
-class ExtensionHost;
 class GURL;
 
+namespace extensions {
+class ExtensionHost;
+}
+
 class ExtensionPopupGtk : public content::NotificationObserver,
                           public BubbleDelegateGtk,
                           public ExtensionViewGtk::Container {
@@ -68,7 +71,7 @@ class ExtensionPopupGtk : public content::NotificationObserver,
 
  private:
   ExtensionPopupGtk(Browser* browser,
-                    ExtensionHost* host,
+                    extensions::ExtensionHost* host,
                     GtkWidget* anchor,
                     ShowAction show_action);
   virtual ~ExtensionPopupGtk();
@@ -86,7 +89,7 @@ class ExtensionPopupGtk : public content::NotificationObserver,
   BubbleGtk* bubble_;
 
   // We take ownership of the popup ExtensionHost.
-  scoped_ptr<ExtensionHost> host_;
+  scoped_ptr<extensions::ExtensionHost> host_;
 
   // The widget for anchoring the position of the bubble.
   GtkWidget* anchor_;