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

Source/platform/geometry/IntRect.h

 /*
  * Copyright (C) 2003, 2006, 2009 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef IntRect_h
 #define IntRect_h
 
 #include "platform/geometry/IntPoint.h"
 #include "wtf/FastAllocBase.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;
 struct SkIRect;
 
 namespace WebCore {
 
 class FloatRect;
 class LayoutRect;
@@ skipping 97 matching lines @@
     void inflate(int d) { inflateX(d); inflateY(d); }
     void scale(float s);
 
     IntSize differenceToPoint(const IntPoint&) const;
     int distanceSquaredToPoint(const IntPoint& p) const { return differenceToPoint(p).diagonalLengthSquared(); }
 
     IntRect transposedRect() const { return IntRect(m_location.transposedPoint(), m_size.transposedSize()); }
 
 #if OS(MACOSX)
     operator CGRect() const;
-#if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
+#if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
     operator NSRect() const;
 #endif
 #endif
 
     operator SkRect() const;
     operator SkIRect() const;
 
 private:
     IntPoint m_location;
     IntSize m_size;
@@ skipping 20 matching lines @@
     return a.location() == b.location() && a.size() == b.size();
 }
 
 inline bool operator!=(const IntRect& a, const IntRect& b)
 {
     return a.location() != b.location() || a.size() != b.size();
 }
 
 #if OS(MACOSX)
 PLATFORM_EXPORT IntRect enclosingIntRect(const CGRect&);
-#if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
+#if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
 PLATFORM_EXPORT IntRect enclosingIntRect(const NSRect&);
 #endif
 #endif
 
 } // namespace WebCore
 
 #endif // IntRect_h