Improve RAII of StyleResolverState.

Source/core/css/resolver/FontBuilderTest.cpp

Index: Source/core/css/resolver/FontBuilderTest.cpp
diff --git a/Source/core/css/resolver/FontBuilderTest.cpp b/Source/core/css/resolver/FontBuilderTest.cpp
index e272ebc3b7861e60811c6753d82de52576abe1fb..7aac1c47ff164f2381b1eaefeed844d2388f3694 100644
--- a/Source/core/css/resolver/FontBuilderTest.cpp
+++ b/Source/core/css/resolver/FontBuilderTest.cpp
@@ -4,6 +4,7 @@
 
 #include "config.h"
 #include "core/css/resolver/FontBuilder.h"
+#include "core/rendering/style/RenderStyle.h"
 #include "core/testing/DummyPageHolder.h"
 
 #include <gtest/gtest.h>
@@ -21,8 +22,9 @@ protected:
 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