Revert 202215 "Migrate the IndexedDB backend from Blink to Chromium"

Revert 202215 "Migrate the IndexedDB backend from Blink to Chromium"

> Migrate the IndexedDB backend from Blink to Chromium
>
> To get the IDB backend off the (deprecated) WebKit thread, remove
> intermediate proxying, and let us take advantage of base utilities,
> we're moving the code from Blink to Chromium.
>
> This patch is basically a glorified copy/paste of the Blink IDB
> backend code, with Chromium coding style applied, WTF dependencies
> replaced with STL and base/, redundant classes removed, etc. It
> introduces some new temporary proxy classes
> (content/browser/webidb*_impl.*) to allow us build both the old and
> new backends.
>
> The new backend is currently disabled by default. It can be enabled
> using a new (and temporary) command line switch: --new-indexeddb Once
> we've done some further cleanup and are confident that the new backend
> is stable, and the bots have moved from DumpRenderTree to
> content_shell, we'll switch to the new backend by default. Once that
> has survived through a dev channel release, we'll delete the Blink
> code and eliminate unnecessary proxy classes.
>
> BUG=234278
> R=alecflett@chromium.org, dgrogan@chromium.org, piman@chromium.org
>
> Review URL: https://codereview.chromium.org/15564008

TBR=jsbell@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202302

[xiyuan, 2013-05-25 15:52:10]

Fails on Windows debug test bots, MS STL vector assertion on index.

e.g.
http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%28...
http://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%28dbg%29%281%...
http://build.chromium.org/p/chromium.win/builders/Win%20Aura%20Tests%20%282%2...

IndexedDBBackingStoreTest.CreateDatabase: 
c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(70) :
Assertion failed: vector iterator not dereferencable
c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(71) :
Assertion failed: "Standard C++ Libraries Out of Range" && 0

[xiyuan, 2013-05-25 15:52:23]

Committed patchset #1 manually as r202302.

[jsbell, 2013-05-28 15:35:32]

Thanks for the revert - lgtm

Didn't show up on the try bots, but trivially reproduceable with VC++10.