Address clang complaint about possible unrecognized function call....

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller_unittest.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller_unittest.mm
===================================================================
--- chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller_unittest.mm	(revision 71059)
+++ chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller_unittest.mm	(working copy)
@@ -470,12 +470,12 @@
   // Also, for each scroll, make sure our hit test finds a new button
   // (to confirm the content area changed).
   NSView* savedHit = nil;
-  NSView* scrollView = [bbfc scrollView];
+  NSScrollView* scrollView = [bbfc scrollView];
 
   // Find the next-to-last button showing at the bottom of the window and
   // us its center for hit testing.
   BookmarkButton* targetButton = nil;
-  NSPoint scrollPoint = [[bbfc scrollView] documentVisibleRect].origin;
+  NSPoint scrollPoint = [scrollView documentVisibleRect].origin;
   for (BookmarkButton* button in [bbfc buttons]) {
     NSRect buttonFrame = [button frame];
     buttonFrame.origin.y -= scrollPoint.y;
@@ -1199,7 +1199,7 @@
   NSRect menuFrame = [folderView frame];
   NSView* visibleView = [folderController visibleView];
   NSRect visibleFrame = [visibleView frame];
-  NSView* scrollView = [folderController scrollView];
+  NSScrollView* scrollView = [folderController scrollView];
   NSRect scrollFrame = [scrollView frame];
 
   // Determine the margins between the scroll frame and the visible frame.