Oilpan: Build fix after r167288

Source/core/inspector/InspectorDOMStorageAgent.cpp

Index: Source/core/inspector/InspectorDOMStorageAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMStorageAgent.cpp b/Source/core/inspector/InspectorDOMStorageAgent.cpp
index 5c790880dd7db4d1df8a904db614163bcfda972c..56c76bc4fc3ed5633cb747c36104408fb0091fbe 100644
--- a/Source/core/inspector/InspectorDOMStorageAgent.cpp
+++ b/Source/core/inspector/InspectorDOMStorageAgent.cpp
@@ -201,14 +201,14 @@ PassOwnPtrWillBeRawPtr<StorageArea> InspectorDOMStorageAgent::findStorageArea(Er
     if (!success) {
         if (errorString)
             *errorString = "Invalid storageId format";
-        return nullptr;
+        return 0;
     }
 
     Frame* frame = m_pageAgent->findFrameWithSecurityOrigin(securityOrigin);
     if (!frame) {
         if (errorString)
             *errorString = "Frame not found for the given security origin";
-        return nullptr;
+        return 0;
     }
     targetFrame = frame;