[Mac] Rely on science, not chance, to get the proper definition of the macro

Source/platform/geometry/FloatRect.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 14 matching lines @@
  */
 
 #ifndef FloatRect_h
 #define FloatRect_h
 
 #include "platform/geometry/FloatPoint.h"
 #include "wtf/Vector.h"
 
 #if OS(MACOSX)
 typedef struct CGRect CGRect;
-#ifdef NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES
-typedef struct CGRect NSRect;
-#else
-typedef struct _NSRect NSRect;
+
+#ifdef __OBJC__
+#import <Foundation/Foundation.h>
 #endif
 #endif
 
 struct SkRect;
 
 namespace WebCore {
 
 class LayoutRect;
 class IntRect;
 class IntPoint;
@@ skipping 111 matching lines @@
     FloatRect transposedRect() const { return FloatRect(m_location.transposedPoint(), m_size.transposedSize()); }
 
     // Re-initializes this rectangle to fit the sets of passed points.
     void fitToPoints(const FloatPoint& p0, const FloatPoint& p1);
     void fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2);
     void fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3);
 
 #if OS(MACOSX)
     FloatRect(const CGRect&);
     operator CGRect() const;
-#if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
+#if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
     FloatRect(const NSRect&);
     operator NSRect() const;
 #endif
 #endif
 
     operator SkRect() const;
 
 private:
     FloatPoint m_location;
     FloatSize m_size;
@@ skipping 53 matching lines @@
 PLATFORM_EXPORT IntRect enclosedIntRect(const FloatRect&);
 
 PLATFORM_EXPORT IntRect roundedIntRect(const FloatRect&);
 
 // Map supplied rect from srcRect to an equivalent rect in destRect.
 PLATFORM_EXPORT FloatRect mapRect(const FloatRect&, const FloatRect& srcRect, const FloatRect& destRect);
 
 }
 
 #endif