[Mac] Create transparent cursor when given empty custom data.

webkit/glue/webcursor.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_GLUE_WEBCURSOR_H_
 #define WEBKIT_GLUE_WEBCURSOR_H_
 
 #include "base/basictypes.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
@@ skipping 84 matching lines @@
   NSCursor* GetCursor() const;
 
   // Initialize this from the given Carbon ThemeCursor.
   void InitFromThemeCursor(ThemeCursor cursor);
 
   // Initialize this from the given Carbon Cursor.
   void InitFromCursor(const Cursor* cursor);
 
   // Initialize this from the given Cocoa NSCursor.
   void InitFromNSCursor(NSCursor* cursor);
-
-  // TODO(shess): Temporary accessor for debugging http://crbug.com/73356 .
-  const gfx::Size& custom_size() const { return custom_size_; }
 #endif
 
  private:
   // Copies the contents of the WebCursor instance passed in.
   void Copy(const WebCursor& other);
 
   // Cleans up the WebCursor instance.
   void Clear();
 
   // Platform specific initialization goes here.
@@ skipping 37 matching lines @@
   HCURSOR custom_cursor_;
 #endif  // OS_WIN
 
 #if defined(USE_X11)
   // A custom cursor created that should be unref'ed from the destructor.
   GdkCursor* unref_;
 #endif
 };
 
 #endif  // WEBKIT_GLUE_WEBCURSOR_H_