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

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

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/scoped_nsobject.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
@@ skipping 452 matching lines @@
   EXPECT_CGFLOAT_EQ(0.0, [window frame].origin.y);
 
   // Initially, should show scroll-up but not scroll-down.
   EXPECT_TRUE([bbfc canScrollUp]);
   EXPECT_FALSE([bbfc canScrollDown]);
 
   // Scroll up a bit.  Make sure the window has gotten bigger each time.
   // 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;
     if (buttonFrame.origin.y < 0.0)
       break;
     targetButton = button;
   }
   NSPoint hitPoint = [targetButton frame].origin;
   hitPoint.x += 50.0;
   hitPoint.y += (bookmarks::kBookmarkButtonHeight / 2.0) - scrollPoint.y;
@@ skipping 703 matching lines @@
   // Now add a real bookmark and reopen.
   model.AddURL(folder, folder->GetChildCount(), ASCIIToUTF16("a"),
                GURL("http://a.com/"));
   folderController = [bar_ folderController];
   EXPECT_TRUE(folderController);
   NSView* folderView = [folderController folderView];
   EXPECT_TRUE(folderView);
   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.
   CGFloat widthDelta = NSWidth(visibleFrame) - NSWidth(scrollFrame);
 
   CGFloat menuHeight = NSHeight(menuFrame);
   EXPECT_CGFLOAT_EQ(expectedHeight, menuHeight);
   CGFloat scrollerWidth = NSWidth(scrollFrame);
   button = [folderController buttonWithTitleEqualTo:@"a"];
   CGFloat buttonWidth = NSWidth([button frame]);
@@ skipping 340 matching lines @@
   [folder deleteBookmark:folder];
   EXPECT_FALSE([folder folderController]);
 }
 
 // TODO(jrg): draggingEntered: and draggingExited: trigger timers so
 // they are hard to test.  Factor out "fire timers" into routines
 // which can be overridden to fire immediately to make behavior
 // confirmable.
 // There is a similar problem with mouseEnteredButton: and
 // mouseExitedButton:.