Move Extension into extensions namespace

chrome/browser/ui/views/frame/browser_view.h

Index: chrome/browser/ui/views/frame/browser_view.h
diff --git a/chrome/browser/ui/views/frame/browser_view.h b/chrome/browser/ui/views/frame/browser_view.h
index 8be8d251886b4653c12507b6ba86c087b265ac50..27c974ad0604f91095693517aa2a20b5db6de844 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -42,7 +42,6 @@ class Browser;
 class BrowserViewLayout;
 class ContentsContainer;
 class DownloadShelfView;
-class Extension;
 class FullscreenExitBubbleViews;
 class InfoBarContainerView;
 class LocationBarView;
@@ -59,6 +58,10 @@ class JumpList;
 class BrowserLauncherItemController;
 #endif
 
+namespace extensions {
+class Extension;
+}
+
 namespace views {
 class AccessiblePaneView;
 class ExternalFocusTracker;
@@ -302,7 +305,7 @@ class BrowserView : public BrowserWindow,
   virtual void ShowCreateWebAppShortcutsDialog(
       TabContentsWrapper* tab_contents) OVERRIDE;
   virtual void ShowCreateChromeAppShortcutsDialog(
-      Profile*, const Extension* app) OVERRIDE;
+      Profile*, const extensions::Extension* app) OVERRIDE;
   virtual void Cut() OVERRIDE;
   virtual void Copy() OVERRIDE;
   virtual void Paste() OVERRIDE;