mac: Update clients of scoped_nsobject.h.

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

Index: chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
index 2a338bb1551e0d81abbf2c7831d0fa0fcb8ca9c6..e24351a29d2272490f3e7762c5807f22eb2cccb6 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
@@ -108,8 +108,8 @@ const NSTimeInterval kTearDuration = 0.333;
   // When spinning the event loop, a tab can get detached, which could lead to
   // our own destruction. Keep ourselves around while spinning the loop as well
   // as the tab controller being dragged.
-  scoped_nsobject<TabStripDragController> keepAlive([self retain]);
-  scoped_nsobject<TabController> keepAliveTab([tab retain]);
+  base::scoped_nsobject<TabStripDragController> keepAlive([self retain]);
+  base::scoped_nsobject<TabController> keepAliveTab([tab retain]);
 
   // Because we move views between windows, we need to handle the event loop
   // ourselves. Ideally we should use the standard event loop.