Perf Tryjob: CSSValue refactor step 1

Source/core/html/canvas/CanvasFontCache.cpp

 // 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.
 
 #include "config.h"
 
 #include "core/html/canvas/CanvasFontCache.h"
 
 #include "core/css/parser/CSSParser.h"
 #include "core/dom/Document.h"
@@ skipping 40 matching lines @@
         parsedStyle = i->value;
         m_fontLRUList.remove(fontString);
         m_fontLRUList.add(fontString);
     } else {
         parsedStyle = MutableStylePropertySet::create();
         CSSParser::parseValue(parsedStyle.get(), CSSPropertyFont, fontString, true, HTMLStandardMode, 0);
         if (parsedStyle->isEmpty())
             return nullptr;
         // According to http://lists.w3.org/Archives/Public/public-html/2009Jul/0947.html,
         // the "inherit" and "initial" values must be ignored.
-        RefPtrWillBeRawPtr<CSSValue> fontValue = parsedStyle->getPropertyCSSValue(CSSPropertyFontSize);
+        NullableCSSValue fontValue = parsedStyle->getPropertyCSSValue(CSSPropertyFontSize);
         if (fontValue && (fontValue->isInitialValue() || fontValue->isInheritedValue()))
             return nullptr;
         m_fetchedFonts.add(fontString, parsedStyle);
         m_fontLRUList.add(fontString);
         // Hard limit is applied here, on the fly, while the soft limit is
         // applied at the end of the task.
         if (m_fetchedFonts.size() > hardMaxFonts()) {
             ASSERT(m_fetchedFonts.size() == hardMaxFonts() + 1);
             ASSERT(m_fontLRUList.size() == hardMaxFonts() + 1);
             m_fetchedFonts.remove(m_fontLRUList.first());
@@ skipping 39 matching lines @@
 }
 
 DEFINE_TRACE(CanvasFontCache)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_fetchedFonts);
 #endif
 }
 
 } // blink