base: Cleanup class/struct forward declarations

base/mac/bundle_locations.h

 // Copyright (c) 2012 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 BASE_MAC_BUNDLE_LOCATIONS_H_
 #define BASE_MAC_BUNDLE_LOCATIONS_H_
 
 #include "base/base_export.h"
 #include "base/files/file_path.h"
 
 #if defined(__OBJC__)
 #import <Foundation/Foundation.h>
 #else  // __OBJC__
 class NSBundle;
-class NSString;
 #endif  // __OBJC__
 
 namespace base {
 
 class FilePath;
 
 namespace mac {
 
 // This file provides several functions to explicitly request the various
 // component bundles of Chrome.  Please use these methods rather than calling
@@ skipping 32 matching lines @@
 BASE_EXPORT void SetOverrideFrameworkBundle(NSBundle* bundle);
 
 // Same as above but accepting a FilePath argument.
 BASE_EXPORT void SetOverrideOuterBundlePath(const FilePath& file_path);
 BASE_EXPORT void SetOverrideFrameworkBundlePath(const FilePath& file_path);
 
 }  // namespace mac
 }  // namespace base
 
 #endif  // BASE_MAC_BUNDLE_LOCATIONS_H_