:hover style not applied on hover if its display property is different from original style's

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 3d5380233102ba5c1d54e9a4ff136cf599fc3bd4..ae3e1179cb52aa583fb7d186e25c0d1c6dd88f65 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -496,8 +496,8 @@ public:
 
     CachedResourceLoader* cachedResourceLoader() { return m_cachedResourceLoader.get(); }
 
-    virtual void attach();
-    virtual void detach();
+    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
+    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     void prepareForDestruction();
 
     // Override ScriptExecutionContext methods to do additional work