Replace CSSParserString with StringView.

third_party/WebKit/Source/core/css/parser/CSSAtRuleID.h

 // Copyright 2015 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 CSSAtRuleID_h
 #define CSSAtRuleID_h
 
+#include "wtf/text/StringView.h"
+
 namespace blink {
 
-struct CSSParserString;
 class UseCounter;
 
 enum CSSAtRuleID {
     CSSAtRuleInvalid = 0,
 
     CSSAtRuleCharset = 1,
     CSSAtRuleFontFace = 2,
     CSSAtRuleImport = 3,
     CSSAtRuleKeyframes = 4,
     CSSAtRuleMedia = 5,
     CSSAtRuleNamespace = 6,
     CSSAtRulePage = 7,
     CSSAtRuleSupports = 8,
     CSSAtRuleViewport = 9,
 
     CSSAtRuleWebkitKeyframes = 10,
     CSSAtRuleApply = 11,
 };
 
-CSSAtRuleID cssAtRuleID(const CSSParserString&);
+CSSAtRuleID cssAtRuleID(StringView name);
 
 void countAtRule(UseCounter*, CSSAtRuleID);
 
 } // namespace blink
 
 #endif // CSSAtRuleID_h