Oilpan: Prepare to move InspectorDatabaseResource to Oilpan heap.

Source/modules/webdatabase/InspectorDatabaseAgent.h

Index: Source/modules/webdatabase/InspectorDatabaseAgent.h
diff --git a/Source/modules/webdatabase/InspectorDatabaseAgent.h b/Source/modules/webdatabase/InspectorDatabaseAgent.h
index cdeb4b6b4bdc1153ac1106dca882287e09a1d55d..b18f28399565fb4db63791c1474676bb9bad6299 100644
--- a/Source/modules/webdatabase/InspectorDatabaseAgent.h
+++ b/Source/modules/webdatabase/InspectorDatabaseAgent.h
@@ -75,8 +75,8 @@ private:
     InspectorDatabaseResource* findByFileName(const String& fileName);
 
     InspectorFrontend::Database* m_frontend;
-    typedef HashMap<String, RefPtr<InspectorDatabaseResource> > DatabaseResourcesMap;
-    DatabaseResourcesMap m_resources;
+    typedef WillBePersistentHeapHashMap<String, RefPtrWillBeMember<InspectorDatabaseResource> > DatabaseResourcesHeapMap;
+    DatabaseResourcesHeapMap m_resources;
     bool m_enabled;
 };