Clean up the Linux WebThemeEngine impl according to the coding style rules

webkit/glue/webthemeengine_impl_mac.h

Index: webkit/glue/webthemeengine_impl_mac.h
diff --git a/webkit/glue/webthemeengine_impl_mac.h b/webkit/glue/webthemeengine_impl_mac.h
index 1c6c166058c560828b4a9d84e0394c8c526cc73c..d444878897f581de762a0adbf176484542b8a052 100644
--- a/webkit/glue/webthemeengine_impl_mac.h
+++ b/webkit/glue/webthemeengine_impl_mac.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -13,11 +13,11 @@ class WebThemeEngineImpl : public WebKit::WebThemeEngine {
  public:
   // WebKit::WebThemeEngine implementation.
   virtual void paintScrollbarThumb(
-      WebKit::WebCanvas*,
-      WebKit::WebThemeEngine::State,
-      WebKit::WebThemeEngine::Size,
-      const WebKit::WebRect&,
-      const WebKit::WebThemeEngine::ScrollbarInfo&);
+      WebKit::WebCanvas* canvas,
+      WebKit::WebThemeEngine::State part,
+      WebKit::WebThemeEngine::Size state,
+      const WebKit::WebRect& rect,
+      const WebKit::WebThemeEngine::ScrollbarInfo& extra_params);
 };
 
 }  // namespace webkit_glue