Hack to fix Mac64 build break from r169638.

This part of the source is fairly fragile. I had to temporarily add a
direct include to WebFrame.h because typedefs cannot be forward
declared. Unfortunately, this causes IntSize.h to be included before
Cocoa. Since Cocoa.h can set NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES,
this can cause build failures with conflicting typedef redefinitions of
NSRect. To hack around this, we temporarily move the Cocoa.h include to
the header as well.

BUG=355268

Review URL: https://codereview.chromium.org/209663002

git-svn-id: svn://svn.chromium.org/blink/trunk@169826 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/mac/WebSubstringUtil.mm

@@ -29,6 +29,11 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// Temporary hack to avoid breaking build during WebFrame -> WebLocalFrame transition.
+#if __LP64__
+#define NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES 1
+#endif
+
 #include "config.h"
 #include "WebSubstringUtil.h"