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This reverts commit 300dbd0e.

Reason for revert: Timing out on MSAN:

https://luci-milo.appspot.com/buildbot/chromium.webkit/WebKit%20Linux%20Trusty%20MSAN/3438

Original change's description:
> Make passing mojo blobs over IndexedDB work.
> 
> Like other CLs this only adds a mojo blob handle for lifetime purposes,
> but browser-side code still uses the separately passed UUID to actually
> access the blob data.
> 
> Bug: 740744
> Change-Id: I880db368d033473d4b923083b5e84be54e8e1716
> Reviewed-on: https://chromium-review.googlesource.com/608744
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Daniel Murphy <dmurph@chromium.org>
> Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505159}

TBR=dcheng@chromium.org,dmurph@chromium.org,mek@chromium.org,haraken@chromium.org

Change-Id: I570eaf73fa9dc307c50a9593fe51faf61537d0a8
No-Tree-Checks: true
No-Try: true
Bug: 740744
Reviewed-on: https://chromium-review.googlesource.com/691396Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505310}