replace COMPILE_ASSERT with static assert in core/css/

Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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 555 matching lines @@
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.
     return sizeForImmutableStylePropertySetWithPropertyCount(4);
 }
 
 // See the function above if you need to update this.
 struct SameSizeAsStylePropertySet : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsStylePropertySet> {
     unsigned bitfield;
 };
-COMPILE_ASSERT(sizeof(StylePropertySet) == sizeof(SameSizeAsStylePropertySet), style_property_set_should_stay_small);
+static_assert(sizeof(StylePropertySet) == sizeof(SameSizeAsStylePropertySet), "StylePropertySet should stay small");
 
 #ifndef NDEBUG
 void StylePropertySet::showStyle()
 {
     fprintf(stderr, "%s\n", asText().ascii().data());
 }
 #endif
 
 PassRefPtrWillBeRawPtr<MutableStylePropertySet> MutableStylePropertySet::create(CSSParserMode cssParserMode)
 {
@@ skipping 17 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace blink