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In the Indexed DB spec, schema updates occur synchronously from the
perspective of script, e.g. you can create a store then use it
immediately without waiting for a request to complete. That model was
carried through to the back end, but with a subtle issue that the
deletion of a store or index could "race ahead" of a previously
requested use of it.

Change store/index deletion to take place in order with other
requests, so do all the work (in-memory and backing store) during the
scheduled operation, rather than on IPC receipt. Also change
store/index creation to do all the work (in-memory and backing store)
synchronously, since index population is already preemptively done.

And since this requires shuffling when the "abort" operations should
be queued, rework the API there slightly.

BUG=370056,368271, 362723
R=cmumford@chromium.org,ericu@chromium.org

Review URL: https://codereview.chromium.org/277583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272282 0039d316-1c4b-4281-b951-d872f2087c98