Remove modules/webdatabase dependency from core.

Source/modules/webdatabase/DatabaseContext.cpp

Index: Source/modules/webdatabase/DatabaseContext.cpp
diff --git a/Source/modules/webdatabase/DatabaseContext.cpp b/Source/modules/webdatabase/DatabaseContext.cpp
index 60359af8e68d51408463bc5ea964f22392ef92dc..250260a7f22f0a20bccbe0dd5648435ca133c377 100644
--- a/Source/modules/webdatabase/DatabaseContext.cpp
+++ b/Source/modules/webdatabase/DatabaseContext.cpp
@@ -131,6 +131,11 @@ void DatabaseContext::contextDestroyed()
     deref(); // paired with the ref() call on create().
 }
 
+void DatabaseContext::willStop()
+{
+    DatabaseManager::manager().interruptAllDatabasesForContext(this);
+}
+
 // stop() is from stopActiveDOMObjects() which indicates that the owner LocalFrame
 // or WorkerThread is shutting down. Initiate the orderly shutdown by stopping
 // the associated databases.