Cleanup WebKit prefixed names for classes in css directory.

Source/core/css/CSSRegionRule.h

Index: Source/core/css/CSSRegionRule.h
diff --git a/Source/core/css/WebKitCSSRegionRule.h b/Source/core/css/CSSRegionRule.h
similarity index 81%
rename from Source/core/css/WebKitCSSRegionRule.h
rename to Source/core/css/CSSRegionRule.h
index 7a65eb50cd5942f8a3881d350792f2f9c2c423c5..f6f82e1a80bab256f2391aa4834727de22793885 100644
--- a/Source/core/css/WebKitCSSRegionRule.h
+++ b/Source/core/css/CSSRegionRule.h
@@ -28,8 +28,8 @@
  * SUCH DAMAGE.
  */
 
-#ifndef WebKitCSSRegionRule_h
-#define WebKitCSSRegionRule_h
+#ifndef CSSRegionRule_h
+#define CSSRegionRule_h
 
 #include "core/css/CSSGroupingRule.h"
 
@@ -37,17 +37,17 @@ namespace WebCore {
 
 class StyleRuleRegion;
 
-class WebKitCSSRegionRule : public CSSGroupingRule {
+class CSSRegionRule : public CSSGroupingRule {
 public:
-    static PassRefPtr<WebKitCSSRegionRule> create(StyleRuleRegion* rule, CSSStyleSheet* sheet) { return adoptRef(new WebKitCSSRegionRule(rule, sheet)); }
+    static PassRefPtr<CSSRegionRule> create(StyleRuleRegion* rule, CSSStyleSheet* sheet) { return adoptRef(new CSSRegionRule(rule, sheet)); }
 
     virtual CSSRule::Type type() const OVERRIDE { return WEBKIT_REGION_RULE; }
     virtual String cssText() const OVERRIDE;
 
 private:
-    WebKitCSSRegionRule(StyleRuleRegion*, CSSStyleSheet* parent);
+    CSSRegionRule(StyleRuleRegion*, CSSStyleSheet* parent);
 };
 
 }
 
-#endif // WebKitCSSRegionRule_h
+#endif // CSSRegionRule_h