Increment style version for all style changes.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index f557c6f4bd34882fe3a8acf3142abe916e95cf31..8e9c4e32f850ec619e8e9f382b61fd02d097c5b8 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -788,7 +788,6 @@ public:
     void incDOMTreeVersion() { ASSERT(m_lifecycle.stateAllowsTreeMutations()); m_domTreeVersion = ++s_globalTreeVersion; }
     uint64_t domTreeVersion() const { return m_domTreeVersion; }
 
-    void incStyleVersion() { ++m_styleVersion; }
     uint64_t styleVersion() const { return m_styleVersion; }
 
     enum PendingSheetLayout { NoLayoutWithPendingSheets, DidLayoutWithPendingSheets, IgnoreLayoutWithPendingSheets };