Revert of Remove unused sourceData variable in InspectorStyleSheet.

Source/core/inspector/InspectorStyleSheet.cpp

Index: Source/core/inspector/InspectorStyleSheet.cpp
diff --git a/Source/core/inspector/InspectorStyleSheet.cpp b/Source/core/inspector/InspectorStyleSheet.cpp
index f56293458b4eaba7f454cdeba73214af1d3ee851..3ba5912a36034c9707cdf10c5ec7e3b8fed4d332 100644
--- a/Source/core/inspector/InspectorStyleSheet.cpp
+++ b/Source/core/inspector/InspectorStyleSheet.cpp
@@ -674,6 +674,7 @@ PassRefPtr<TypeBuilder::CSS::CSSStyle> InspectorStyle::styleWithProperties() con
     RefPtr<Array<TypeBuilder::CSS::ShorthandEntry> > shorthandEntries = Array<TypeBuilder::CSS::ShorthandEntry>::create();
     HashSet<String> foundShorthands;
     OwnPtr<Vector<unsigned> > lineEndings(m_parentStyleSheet ? m_parentStyleSheet->lineEndings() : PassOwnPtr<Vector<unsigned> >());
+    RefPtrWillBeRawPtr<CSSRuleSourceData> sourceData = extractSourceData();
 
     WillBeHeapVector<InspectorStyleProperty> properties;
     populateAllProperties(properties);
@@ -697,8 +698,10 @@ PassRefPtr<TypeBuilder::CSS::CSSStyle> InspectorStyle::styleWithProperties() con
             property->setImportant(true);
         if (it->hasSource) {
             property->setRange(buildSourceRangeObject(propertyEntry.range, lineEndings.get()));
-            if (!propertyEntry.disabled)
+            if (!propertyEntry.disabled) {
+                ASSERT_UNUSED(sourceData, sourceData);
                 property->setImplicit(false);
+            }
             property->setDisabled(propertyEntry.disabled);
         } else if (!propertyEntry.disabled) {
             bool implicit = m_style->isPropertyImplicit(name);