Avoid spurious errors about NSColor*-CGColor* and NSSize-CGSize conversions

chrome/browser/cocoa/tab_cell.mm

 // Copyright (c) 2009 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 "base/scoped_nsobject.h"
 #import "chrome/browser/cocoa/tab_cell.h"
 #import "third_party/GTM/AppKit/GTMTheme.h"
 #import "third_party/GTM/AppKit/GTMNSColor+Luminance.h"
 
 
@@ skipping 28 matching lines @@
                        inView:controlView];
 }
 
 - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
   GTMTheme* theme = [[self controlView] gtm_theme];
   NSColor* textColor = [theme textColorForStyle:GTMThemeStyleToolBar
                                           state:[self isHighlighted]];
 
   scoped_nsobject<NSShadow> textShadow([[NSShadow alloc] init]);
   [textShadow setShadowBlurRadius:0.0f];
-  [textShadow setShadowColor:[textColor gtm_legibleTextColor]];
-  [textShadow setShadowOffset:NSMakeSize(0.0f, -1.0f)];
+  [textShadow.get() setShadowColor:[textColor gtm_legibleTextColor]];
+  [textShadow.get() setShadowOffset:NSMakeSize(0.0f, -1.0f)];
 
   NSDictionary* attributes =
       [NSDictionary dictionaryWithObjectsAndKeys:
         [self font], NSFontAttributeName,
         textColor, NSForegroundColorAttributeName,
         textShadow.get(), NSShadowAttributeName,
        nil];
 
  [[self title] drawInRect:[self titleRectForBounds:cellFrame]
            withAttributes:attributes];
 
   NSRect imageBounds = NSZeroRect;
   imageBounds.size = [[self image] size];
   [[self image] drawInRect:[self imageRectForBounds:cellFrame]
                   fromRect:imageBounds
                  operation:NSCompositeSourceOver
                   fraction:1.0];
 }
 
 - (void)highlight:(BOOL)flag
         withFrame:(NSRect)cellFrame
            inView:(NSView *)controlView {
   // Don't do normal highlighting
 }
 
 @end