Clear StyleResolverState after each resolve.

Source/core/css/resolver/StyleResolverState.cpp

Index: Source/core/css/resolver/StyleResolverState.cpp
diff --git a/Source/core/css/resolver/StyleResolverState.cpp b/Source/core/css/resolver/StyleResolverState.cpp
index 708c2a849a3487acddc1951face85dbe2d356a4a..0e6b24dfbea0b447a590c8a12aa31f69f2190870 100644
--- a/Source/core/css/resolver/StyleResolverState.cpp
+++ b/Source/core/css/resolver/StyleResolverState.cpp
@@ -31,10 +31,22 @@
 
 namespace WebCore {
 
+StyleResolverState::ScopedStyleResolution::ScopedStyleResolution(StyleResolverState* state, Document* document, Element* e, int childIndex, RenderStyle* parentStyle, RenderRegion* regionForStyling)
+    : m_state(state)
+{
+    m_state->initForStyleResolve(document, e, childIndex, parentStyle, regionForStyling);
+}
+
+StyleResolverState::ScopedStyleResolution::~ScopedStyleResolution()
+{
+    m_state->clear();
+}
+
 void StyleResolverState::clear()
 {
     m_element = 0;
     m_childIndex = 0;
+    m_style = 0;
     m_styledElement = 0;
     m_parentStyle = 0;
     m_parentNode = 0;