Refactor RenderThemeChromiumDefault

Source/core/rendering/RenderThemeChromiumLinux.cpp

+// Copyright 2014 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 "config.h"
+#include "core/rendering/RenderThemeChromiumLinux.h"
+
+#include "core/UserAgentStyleSheets.h"
+
+namespace blink {
+
+PassRefPtr<RenderTheme> RenderThemeChromiumLinux::create()
+{
+    return adoptRef(new RenderThemeChromiumLinux());
+}
+
+RenderTheme& RenderTheme::theme()
+{
+    DEFINE_STATIC_REF(RenderTheme, renderTheme, (RenderThemeChromiumLinux::create()));
+    return *renderTheme;
+}
+
+String RenderThemeChromiumLinux::extraDefaultStyleSheet()
+{
+    return RenderThemeChromiumDefault::extraDefaultStyleSheet() +
+        String(themeChromiumLinuxCss, sizeof(themeChromiumLinuxCss));
+}
+
+} // namespace blink