mac: Update clients of scoped_nsobject.h.

ui/app_list/cocoa/apps_collection_view_drag_manager.mm

Index: ui/app_list/cocoa/apps_collection_view_drag_manager.mm
diff --git a/ui/app_list/cocoa/apps_collection_view_drag_manager.mm b/ui/app_list/cocoa/apps_collection_view_drag_manager.mm
index f759888dbcbd8f765f3d37daaba43d4f283b13a9..a7cc8b2261da9400d02f9980ced8971727555514 100644
--- a/ui/app_list/cocoa/apps_collection_view_drag_manager.mm
+++ b/ui/app_list/cocoa/apps_collection_view_drag_manager.mm
@@ -59,7 +59,7 @@ const CGFloat kDragThreshold = 5;
 }
 
 - (NSCollectionView*)makePageWithFrame:(NSRect)pageFrame {
-  scoped_nsobject<GridCollectionView> itemCollectionView(
+  base::scoped_nsobject<GridCollectionView> itemCollectionView(
       [[GridCollectionView alloc] initWithFrame:pageFrame]);
   [itemCollectionView setFactory:self];
   [itemCollectionView setMaxNumberOfRows:rows_];
@@ -70,7 +70,7 @@ const CGFloat kDragThreshold = 5;
   [itemCollectionView setBackgroundColors:
       [NSArray arrayWithObject:[NSColor clearColor]]];
 
-  scoped_nsobject<AppsGridViewItem> itemPrototype(
+  base::scoped_nsobject<AppsGridViewItem> itemPrototype(
       [[AppsGridViewItem alloc] initWithSize:cellSize_]);
   [[itemPrototype button] setTarget:gridController_];
   [[itemPrototype button] setAction:@selector(onItemClicked:)];