Oilpan: Fix build after r180164.

BUG=

Review URL: https://codereview.chromium.org/468103002

git-svn-id: svn://svn.chromium.org/blink/trunk@180169 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp

@@ -1127,7 +1127,6 @@ CSSStyleRule* InspectorStyleSheet::insertCSSOMRuleBySourceRange(const SourceRang
 bool InspectorStyleSheet::verifyRuleText(const String& ruleText)
 {
     DEFINE_STATIC_LOCAL(String, bogusPropertyName, ("-webkit-boguz-propertee"));
-    RefPtrWillBeRawPtr<MutableStylePropertySet> tempMutableStyle = MutableStylePropertySet::create();
     RuleSourceDataList sourceData;
     RefPtrWillBeRawPtr<StyleSheetContents> styleSheetContents = StyleSheetContents::create(strictCSSParserContext());
     String text = ruleText + " div { " + bogusPropertyName + ": none; }";