[Mac/Cleanup] Trim down Foundation.h and ApplicationServices.h includes

printing/printing_context_mac.h

 // Copyright (c) 2011 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 PRINTING_PRINTING_CONTEXT_MAC_H_
 #define PRINTING_PRINTING_CONTEXT_MAC_H_
 
+#include <ApplicationServices/ApplicationServices.h>
 #include <string>
 
 #include "base/mac/scoped_nsobject.h"
 #include "printing/print_job_constants.h"
 #include "printing/printing_context.h"
 
-#ifdef __OBJC__
 @class NSPrintInfo;
-#else
-class NSPrintInfo;
-#endif  // __OBJC__
 
 namespace printing {
 
 class PRINTING_EXPORT PrintingContextMac : public PrintingContext {
  public:
   explicit PrintingContextMac(Delegate* delegate);
   ~PrintingContextMac() override;
 
   // PrintingContext implementation.
   void AskUserForSettings(int max_pages,
@@ skipping 67 matching lines @@
   // The current page's context; only valid between NewPage and PageDone call
   // pairs.
   CGContext* context_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintingContextMac);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_MAC_H_