Rewrite references to "wtf/" to "platform/wtf/" in core/css and core/style.

third_party/WebKit/Source/core/css/CSSFontVariationValue.cpp

 // Copyright 2016 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 "core/css/CSSFontVariationValue.h"
 
-#include "wtf/text/StringBuilder.h"
+#include "platform/wtf/text/StringBuilder.h"
 
 namespace blink {
 
 CSSFontVariationValue::CSSFontVariationValue(const AtomicString& tag,
                                              float value)
     : CSSValue(kFontVariationClass), tag_(tag), value_(value) {}
 
 String CSSFontVariationValue::CustomCSSText() const {
   StringBuilder builder;
   builder.Append('\'');
   builder.Append(tag_);
   builder.Append("' ");
   builder.AppendNumber(value_);
   return builder.ToString();
 }
 
 bool CSSFontVariationValue::Equals(const CSSFontVariationValue& other) const {
   return tag_ == other.tag_ && value_ == other.value_;
 }
 
 }  // namespace blink