ozone: Allow building for ozone without depending on pango

ui/gfx/platform_font_ozone.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2013 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.
 
 #include "ui/gfx/platform_font.h"
 
-#include "base/logging.h"
-
 namespace gfx {
 
-// static
 PlatformFont* PlatformFont::CreateDefault() {
-  NOTIMPLEMENTED();
   return NULL;
 }
 
-// static
 PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) {
-  NOTIMPLEMENTED();
   return NULL;
 }
 
-// static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
-  NOTIMPLEMENTED();
   return NULL;
 }
 
-} // namespace gfx
+}  // namespace gfx