[Mac] Clean up SadTabView and let SadTabController provide its content

ui/gfx/test/ui_cocoa_test_helper.h

 // Copyright 2014 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.
 
 #ifndef UI_GFX_TEST_UI_COCOA_TEST_HELPER_H_
 #define UI_GFX_TEST_UI_COCOA_TEST_HELPER_H_
 
 #include <set>
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/compiler_specific.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
+#import "base/mac/scoped_nsobject.h"
 #include "testing/platform_test.h"
 
 // Background windows normally will not display things such as focus
 // rings.  This class allows -isKeyWindow to be manipulated to test
 // such things.
 @interface CocoaTestHelperWindow : NSWindow {
  @private
   BOOL pretendIsKeyWindow_;
   BOOL useDefaultConstraints_;
 }
@@ skipping 121 matching lines @@
 #define EXPECT_NSRECT_EQ(expected, actual) \
     EXPECT_TRUE(CGFLOAT_EQ(expected.origin.x, actual.origin.x) && \
                 CGFLOAT_EQ(expected.origin.y, actual.origin.y) && \
                 CGFLOAT_EQ(expected.size.width, actual.size.width) && \
                 CGFLOAT_EQ(expected.size.height, actual.size.height)) << \
                 "Rects do not match: " << \
                 [NSStringFromRect(expected) UTF8String] << \
                 " != " << [NSStringFromRect(actual) UTF8String]
 
 #endif  // UI_GFX_TEST_UI_COCOA_TEST_HELPER_H_