Adds some ifdefs so that test_shell can be compiled on linux...

chrome/common/gfx/path.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 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 CHROME_COMMON_GFX_CHROME_PATH_H_
 #define CHROME_COMMON_GFX_CHROME_PATH_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_LINUX)
 typedef struct _GdkRegion GdkRegion;
 #endif
 
 #include "SkPath.h"
 
 namespace gfx {
 
 class Path : public SkPath {
  public:
   Path() : SkPath() { moveTo(0, 0); }
 
 #if defined(OS_WIN)
   // Creates a HRGN from the path. The caller is responsible for freeing
   // resources used by this region.  This only supports polygon paths.
   HRGN CreateHRGN() const;
-#elif defined(OS_LINUX)
+#elif defined(TOOLKIT_GTK)
   // Creates a Gdkregion from the path. The caller is responsible for freeing
   // resources used by this region.  This only supports polygon paths.
   GdkRegion* CreateGdkRegion() const;
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Path);
 };
 
 }
 
 #endif  // #ifndef CHROME_COMMON_GFX_CHROME_PATH_H_