Fix the content_browsertests everywhere maybe.

chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h

Index: chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h
diff --git a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h
index 4bb8cfe246747a212cd2c26ba81ce3622161bfe4..c6573c7797f6d8ead0fd4e6e6fb06b72438ee80b 100644
--- a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h
+++ b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.h
@@ -10,12 +10,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chrome_browser_main_extra_parts.h"
 
-namespace aura {
-namespace client {
-class StackingClient;
-}
-}
-
 class ActiveDesktopMonitor;
 
 class ChromeBrowserMainExtraPartsAura : public ChromeBrowserMainExtraParts {
@@ -28,7 +22,6 @@ class ChromeBrowserMainExtraPartsAura : public ChromeBrowserMainExtraParts {
   virtual void PostMainMessageLoopRun() OVERRIDE;
 
  private:
-  scoped_ptr<aura::client::StackingClient> stacking_client_;
   scoped_ptr<ActiveDesktopMonitor> active_desktop_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainExtraPartsAura);