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 7790935050aa7fd6a20e153ab871513268c32870..7cc4222fcc454abe005f877e25a16d6e83ebc37d 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -41,7 +41,6 @@ class Browser;
 class BrowserViewLayout;
 class ContentsContainer;
 class DownloadShelfView;
-class Extension;
 class FullscreenExitBubbleViews;
 class InfoBarContainerView;
 class LocationBarView;
@@ -58,6 +57,10 @@ class JumpList;
 class BrowserLauncherItemController;
 #endif
 
+namespace extensions {
+class Extension;
+}
+
 namespace views {
 class AccessiblePaneView;
 class ExternalFocusTracker;
@@ -298,7 +301,7 @@ 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;