Improve RAII of StyleResolverState.

Source/core/css/resolver/FontBuilderTest.cpp

 // Copyright 2014 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/css/resolver/FontBuilder.h"
+#include "core/rendering/style/RenderStyle.h"
 #include "core/testing/DummyPageHolder.h"
 
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class FontBuilderTest : public ::testing::Test {
 protected:
     RenderStyle* getStyle(const FontBuilder& builder)
     {
         return builder.m_style;
     }
 };
 
 TEST_F(FontBuilderTest, StylePointerInitialisation)
 {
     OwnPtr<DummyPageHolder> dummy = DummyPageHolder::create(IntSize(800, 600));
-    FontBuilder builder(dummy->document());
-    EXPECT_EQ(0, getStyle(builder));
+    RefPtr<RenderStyle> style = RenderStyle::create();
+    FontBuilder builder(dummy->document(), style.get());
+    EXPECT_EQ(style.get(), getStyle(builder));
 }
 
 } // namespace blink