Merge 190021 "Web SQL: Termiante database thread before finalizi..."

Merge 190021 "Web SQL: Termiante database thread before finalizi..."

> Web SQL: Termiante database thread before finalizing the Oilpan heap for the Blink main thread.
> 
> Oilpan heap for the database thread should be finalized before finalizing the
> main thread heap. Usually it's done in ExecutionContext::stopActiveDOMObjects().
> When blink::shutdown() is called, stopActiveDOMObjects() was not called and
> objects owned by the main thread is finalized though they were referred by the
> database thread.  blink::shutdown() should terminate the database thread
> explicitly.
> 
> BUG=455368, 455789
> 
> Review URL: https://codereview.chromium.org/892343003

TBR=tkent@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190225

[tkent, 2015-02-16 07:01:05]

Committed patchset #1 (id:1) manually as r190225.