resource_bundle_mac_unittest.mm: fix case for AppKit/AppKit.h

ui/base/resource/resource_bundle_mac_unittest.mm

 // Copyright 2015 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 "ui/base/resource/resource_bundle.h"
 
-#import <Appkit/Appkit.h>
+#import <AppKit/AppKit.h>
 
 #include "base/base_paths.h"
 #include "base/big_endian.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 175 matching lines @@
   // Design pack, any images it contains should override the ones in the default
   // pack, so if both packs contain the same image, the returned NSImage should
   // contain just a single representation.
   NSImage* icon = resource_bundle->GetNativeImageNamed(3).ToNSImage();
   const unsigned long representations_count = [[icon representations] count];
   const unsigned long expected_count = 1;
   EXPECT_EQ(expected_count, representations_count);
 }
 
 }  // namespace ui