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

chrome/browser/cocoa/browser_window_controller.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.
 
 #include <Carbon/Carbon.h>
 
 #include "base/mac_util.h"
 #include "base/scoped_nsdisable_screen_updates.h"
 #import "base/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
@@ skipping 1068 matching lines @@
   NSRect incognitoFrame = tabFrame;
   incognitoFrame.origin.x = NSMaxX(incognitoFrame) - imageSize.width -
                               kOffset;
   incognitoFrame.size = imageSize;
   scoped_nsobject<NSImageView> incognitoView(
       [[NSImageView alloc] initWithFrame:incognitoFrame]);
   [incognitoView setImage:incognitoImage.get()];
   [incognitoView setWantsLayer:YES];
   [incognitoView setAutoresizingMask:NSViewMinXMargin | NSViewMinYMargin];
   scoped_nsobject<NSShadow> shadow([[NSShadow alloc] init]);
-  [shadow setShadowColor:[NSColor colorWithCalibratedWhite:0.0 alpha:0.5]];
-  [shadow setShadowOffset:NSMakeSize(0, -1)];
+  [shadow.get() setShadowColor:[NSColor colorWithCalibratedWhite:0.0
+                                                           alpha:0.5]];
+  [shadow.get() setShadowOffset:NSMakeSize(0, -1)];
   [shadow setShadowBlurRadius:2.0];
   [incognitoView setShadow:shadow];
 
   // Shrink the tab strip's width so there's no overlap and install the
   // view.
   tabFrame.size.width -= incognitoFrame.size.width + kOffset;
   [[self tabStripView] setFrame:tabFrame];
   [[[[self window] contentView] superview] addSubview:incognitoView.get()];
 }
 
@@ skipping 291 matching lines @@
       provider->GetNSColor(BrowserThemeProvider::COLOR_TOOLBAR);
   [theme setValue:toolbarBackgroundColor
      forAttribute:@"backgroundColor"
             style:GTMThemeStyleToolBar
             state:GTMThemeStateActiveWindow];
 
   return theme;
 }
 @end