Don't create m_style for option element in display:none subtree.

third_party/WebKit/Source/core/html/HTMLOptionElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLOptionElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLOptionElement.cpp b/third_party/WebKit/Source/core/html/HTMLOptionElement.cpp
index 6c8e8420a37d57dcfaea0030fa9d2a20b106a2be..3f85a53534bdc75a37565030ea4201e165bcdc38 100644
--- a/third_party/WebKit/Source/core/html/HTMLOptionElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLOptionElement.cpp
@@ -94,7 +94,7 @@ void HTMLOptionElement::attach(const AttachContext& context)
     if (context.resolvedStyle) {
         ASSERT(!m_style || m_style == context.resolvedStyle);
         m_style = context.resolvedStyle;
-    } else {
+    } else if (parentComputedStyle()) {
         updateNonComputedStyle();
         optionContext.resolvedStyle = m_style.get();
     }