base: Remove stub scoped_variant_win.h file.

chrome_frame/test/chrome_frame_ui_test_utils.h

Index: chrome_frame/test/chrome_frame_ui_test_utils.h
diff --git a/chrome_frame/test/chrome_frame_ui_test_utils.h b/chrome_frame/test/chrome_frame_ui_test_utils.h
index 0b8c1f2a537315ec59679a651ee6823dbf718125..1f493954b5ef193e269f2d21310f4325482dbdbb 100644
--- a/chrome_frame/test/chrome_frame_ui_test_utils.h
+++ b/chrome_frame/test/chrome_frame_ui_test_utils.h
@@ -12,7 +12,7 @@
 
 #include "base/ref_counted.h"
 #include "base/scoped_comptr_win.h"
-#include "base/scoped_variant_win.h"
+#include "base/win/scoped_variant.h"
 #include "chrome_frame/test/win_event_receiver.h"
 
 namespace gfx {
@@ -155,7 +155,7 @@ class AccObject : public base::RefCounted<AccObject> {
   bool PostMouseButtonMessages(int button_up, int button_down);
 
   ScopedComPtr<IAccessible> accessible_;
-  ScopedVariant child_id_;
+  base::win::ScopedVariant child_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AccObject);
 };
@@ -229,7 +229,7 @@ class AccEventObserver : public WinEventListener {
  private:
   class EventHandler : public base::RefCounted<EventHandler> {
    public:
-    EventHandler(AccEventObserver* observer);
+    explicit EventHandler(AccEventObserver* observer);
 
     // Examines the given event and invokes the corresponding method of its
     // observer.