Remove worker support of Web SQL Database.

Source/modules/webdatabase/DatabaseTracker.h

 /*
  * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 44 matching lines @@
     // notificationMutex() is currently independent of the other locks.
 
     bool canEstablishDatabase(DatabaseContext*, const String& name, const String& displayName, unsigned long estimatedSize, DatabaseError&);
     String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true);
 
     void addOpenDatabase(DatabaseBackendBase*);
     void removeOpenDatabase(DatabaseBackendBase*);
 
     unsigned long long getMaxSizeForDatabase(const DatabaseBackendBase*);
 
-    void interruptAllDatabasesForContext(const DatabaseContext*);
     void closeDatabasesImmediately(const String& originIdentifier, const String& name);
 
     void prepareToOpenDatabase(DatabaseBackendBase*);
     void failedToOpenDatabase(DatabaseBackendBase*);
 
 private:
     typedef HashSet<DatabaseBackendBase*> DatabaseSet;
     typedef HashMap<String, DatabaseSet*> DatabaseNameMap;
     typedef HashMap<String, DatabaseNameMap*> DatabaseOriginMap;
     class CloseOneDatabaseImmediatelyTask;
 
     DatabaseTracker();
 
     void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, DatabaseBackendBase*);
 
     Mutex m_openDatabaseMapGuard;
     mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap;
 };
 
 } // namespace blink
 
 #endif // DatabaseTracker_h