replace COMPILE_ASSERT with static assert in core/css/

Source/core/css/CSSRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 17 matching lines @@
 #include "platform/NotImplemented.h"
 
 namespace blink {
 
 struct SameSizeAsCSSRule : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsCSSRule>, public ScriptWrappable {
     virtual ~SameSizeAsCSSRule();
     unsigned char bitfields;
     void* pointerUnion;
 };
 
-COMPILE_ASSERT(sizeof(CSSRule) == sizeof(SameSizeAsCSSRule), CSSRule_should_stay_small);
+static_assert(sizeof(CSSRule) == sizeof(SameSizeAsCSSRule), "CSSRule should stay small");
 
-COMPILE_ASSERT(StyleRuleBase::Viewport == static_cast<StyleRuleBase::Type>(CSSRule::VIEWPORT_RULE), enums_should_match);
+static_assert(StyleRuleBase::Viewport == static_cast<StyleRuleBase::Type>(CSSRule::VIEWPORT_RULE), "enums should match");
 
 void CSSRule::setCSSText(const String&)
 {
     notImplemented();
 }
 
 const CSSParserContext& CSSRule::parserContext() const
 {
     CSSStyleSheet* styleSheet = parentStyleSheet();
     return styleSheet ? styleSheet->contents()->parserContext() : strictCSSParserContext();
 }
 
 void CSSRule::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     // This makes the parent link strong, which is different from the
     // pre-oilpan world, where the parent link is mysteriously zeroed under
     // some circumstances.
     if (m_parentIsRule)
         visitor->trace(m_parentRule);
     else
         visitor->trace(m_parentStyleSheet);
 #endif
 }
 
 } // namespace blink