Remove worker support of Web SQL Database.

Source/web/WebDatabase.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
 }
 
 WebSecurityOrigin WebDatabase::securityOrigin() const
 {
     ASSERT(m_database);
     return WebSecurityOrigin(m_database->securityOrigin());
 }
 
 bool WebDatabase::isSyncDatabase() const
 {
-    ASSERT(m_database);
-    return m_database->isSyncDatabase();
+    return false;
 }
 
 void WebDatabase::updateDatabaseSize(const WebString& originIdentifier, const WebString& name, long long size)
 {
     QuotaTracker::instance().updateDatabaseSize(originIdentifier, name, size);
 }
 
 void WebDatabase::updateSpaceAvailable(const WebString& originIdentifier, long long spaceAvailable)
 {
     QuotaTracker::instance().updateSpaceAvailableToOrigin(originIdentifier, spaceAvailable);
 }
 
 void WebDatabase::resetSpaceAvailable(const WebString& originIdentifier)
 {
     QuotaTracker::instance().resetSpaceAvailableToOrigin(originIdentifier);
 }
 
 void WebDatabase::closeDatabaseImmediately(const WebString& originIdentifier, const WebString& databaseName)
 {
     DatabaseManager::manager().closeDatabasesImmediately(originIdentifier, databaseName);
 }
 
 WebDatabase::WebDatabase(const DatabaseBackendBase* database)
     : m_database(database)
 {
 }
 
 } // namespace blink