Code:  IndexedDBDispatcher::~IndexedDBDispatcher() {
  g_idb_dispatcher_tls.Pointer()->Set(NULL);
 }

Vulnerability Type: DoS 
CWE ID: CWE-399
Summary: Use-after-free vulnerability in the IndexedDB implementation in Google Chrome before 19.0.1084.46 allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.
Commit Message: Add DCHECK to ensure IndexedDBDispatcher doesn't get re-created.

This could happen if there are IDB objects that survive the call to
didStopWorkerRunLoop.

BUG=121734
TEST=


Review URL: http://codereview.chromium.org/9999035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131679 0039d316-1c4b-4281-b951-d872f2087c98