Rename UI_API to UI_EXPORT.

ui/gfx/mac/nsimage_cache.h

Index: ui/gfx/mac/nsimage_cache.h
===================================================================
--- ui/gfx/mac/nsimage_cache.h	(revision 95624)
+++ ui/gfx/mac/nsimage_cache.h	(working copy)
@@ -6,7 +6,7 @@
 #define UI_GFX_MAC_NSIMAGE_CACHE_H_
 #pragma once
 
-#include "ui/ui_api.h"
+#include "ui/base/ui_export.h"
 
 #ifdef __OBJC__
 @class NSImage;
@@ -25,7 +25,7 @@
 //   - This should only be called on the main thread.
 //   - The caller should retain the image if they want to keep it around, as
 //     the cache could have limit on size/lifetime, etc.
-UI_API NSImage* GetCachedImageWithName(NSString* name);
+UI_EXPORT NSImage* GetCachedImageWithName(NSString* name);
 
 // Clears the image cache.
 void ClearCachedImages(void);