MacViews/a11y: Typedef gfx::NativeViewAccessible to id for all of Mac & iOS.

ui/gfx/native_widget_types.h

Index: ui/gfx/native_widget_types.h
diff --git a/ui/gfx/native_widget_types.h b/ui/gfx/native_widget_types.h
index 44e1d2611c6a277e88153204394b6c64364d2a1b..e2bb463602f8065019dae08a8797d011c5f0e4b3 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -12,6 +12,8 @@
 
 #if defined(OS_ANDROID)
 #include <jni.h>
+#elif defined(OS_MACOSX)
+#include <objc/objc.h>
 #endif
 
 // This file provides cross platform typedefs for native widget types.
@@ -139,18 +141,10 @@ typedef HFONT NativeFont;
 typedef IAccessible* NativeViewAccessible;
 #elif defined(OS_IOS)
 typedef UIFont* NativeFont;
-#ifdef __OBJC__
 typedef id NativeViewAccessible;
-#else
-typedef void* NativeViewAccessible;
-#endif  // __OBJC__
 #elif defined(OS_MACOSX)
 typedef NSFont* NativeFont;
-#ifdef __OBJC__
 typedef id NativeViewAccessible;
-#else
-typedef void* NativeViewAccessible;
-#endif  // __OBJC__
 #else  // Android, Linux, Chrome OS, etc.
 // Linux doesn't have a native font type.
 #if defined(USE_X11) && !defined(OS_CHROMEOS)