Oilpan: fix build after r188764.

Source/core/storage/StorageNamespaceController.cpp

Index: Source/core/storage/StorageNamespaceController.cpp
diff --git a/Source/core/storage/StorageNamespaceController.cpp b/Source/core/storage/StorageNamespaceController.cpp
index b9d2c70bbd2efb137ed70a1fc53bbdcb83d2bcb8..4952a047365542398a68fb2456bbfa9ba8c36bd2 100644
--- a/Source/core/storage/StorageNamespaceController.cpp
+++ b/Source/core/storage/StorageNamespaceController.cpp
@@ -20,6 +20,10 @@ StorageNamespaceController::StorageNamespaceController(StorageClient* client)
 {
 }
 
+StorageNamespaceController::~StorageNamespaceController()
+{
+}
+
 StorageNamespace* StorageNamespaceController::sessionStorage(bool optionalCreate)
 {
     if (!m_sessionStorage && optionalCreate)
@@ -33,4 +37,3 @@ void StorageNamespaceController::provideStorageNamespaceTo(Page& page, StorageCl
 }
 
 } // namespace blink
-