QuotaManager: Don't fire callback if it's null

webkit/browser/quota/quota_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/browser/quota/quota_manager.h"
 
 #include <algorithm>
 #include <deque>
 #include <functional>
 #include <set>
@@ skipping 969 matching lines @@
     int64 new_quota, const QuotaCallback& callback) {
   LazyInitialize();
 
   if (new_quota < 0) {
     if (!callback.is_null())
       callback.Run(kQuotaErrorInvalidModification, -1);
     return;
   }
 
   if (db_disabled_) {
-    if (callback.is_null())
+    if (!callback.is_null())
       callback.Run(kQuotaErrorInvalidAccess, -1);
     return;
   }
 
   int64* new_quota_ptr = new int64(new_quota);
   PostTaskAndReplyWithResultForDBThread(
       FROM_HERE,
       base::Bind(&SetTemporaryGlobalOverrideQuotaOnDBThread,
                  base::Unretained(new_quota_ptr)),
       base::Bind(&QuotaManager::DidSetTemporaryGlobalOverrideQuota,
@@ skipping 578 matching lines @@
   // |database_|, therefore we can be sure that database_ is alive when this
   // task runs.
   base::PostTaskAndReplyWithResult(
       db_thread_.get(),
       from_here,
       base::Bind(task, base::Unretained(database_.get())),
       reply);
 }
 
 }  // namespace quota