Remove a bunch of OS(MACOSX) code

sky/engine/platform/geometry/FloatSize.h

Index: sky/engine/platform/geometry/FloatSize.h
diff --git a/sky/engine/platform/geometry/FloatSize.h b/sky/engine/platform/geometry/FloatSize.h
index 1d73c75d5ac9bd0b66ac1289fdb46fef8c631960..aad68c9bab125dc4c7dc8745acbf78c8f5a1d13d 100644
--- a/sky/engine/platform/geometry/FloatSize.h
+++ b/sky/engine/platform/geometry/FloatSize.h
@@ -31,14 +31,6 @@
 #include "platform/geometry/IntPoint.h"
 #include "wtf/MathExtras.h"
 
-#if OS(MACOSX)
-typedef struct CGSize CGSize;
-
-#ifdef __OBJC__
-#import <Foundation/Foundation.h>
-#endif
-#endif
-
 namespace blink {
 
 class IntSize;
@@ -112,15 +104,6 @@ public:
         return FloatSize(m_width * scaleX, m_height * scaleY);
     }
 
-#if OS(MACOSX)
-    explicit FloatSize(const CGSize&); // don't do this implicitly since it's lossy
-    operator CGSize() const;
-#if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
-    explicit FloatSize(const NSSize &); // don't do this implicitly since it's lossy
-    operator NSSize() const;
-#endif
-#endif
-
 private:
     float m_width, m_height;
 };