Mac: Make ScopedTypeRef require explicit constructors

chrome/browser/ui/cocoa/tabs/tab_view.mm

Index: chrome/browser/ui/cocoa/tabs/tab_view.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_view.mm b/chrome/browser/ui/cocoa/tabs/tab_view.mm
index 27066e711e5d4c555d36fc460b79ea23ef583ce5..ea826ff8b463931d0e02afe74c6a1c385d8b300a 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_view.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_view.mm
@@ -91,10 +91,9 @@ - (HoverCloseButton*)closeButton;
   }
   DCHECK(theSelector);
 
-  base::scoped_nsobject<NSCustomImageRep> imageRep =
-      [[NSCustomImageRep alloc]
-          initWithDrawSelector:theSelector
-                      delegate:[TabView class]];
+  base::scoped_nsobject<NSCustomImageRep> imageRep([[NSCustomImageRep alloc]
+      initWithDrawSelector:theSelector
+                  delegate:[TabView class]]);
 
   NSImage* newTabButtonImage =
       [[[NSImage alloc] initWithSize:NSMakeSize(imageWidth, 29)] autorelease];