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Revert of [Fetch API] Start reading blob only when the reader wants to read contents. (patchset #3 id:40001 of https://codereview.chromium.org/2303753003/ )

Reason for revert:
Speculative revert: this patch is a suspect to cause Linux MSAN failures:

https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Linux%20MSAN/builds/12091

The other suspected patch, the only one related to canvas, was reverted and didn't help.

Original issue's description:
> [Fetch API] Start reading blob only when the reader wants to read contents.
>
> BUG=643174
>
> Committed: https://crrev.com/f1ca96c413912ff1768e4274b8b7ac78eb41de64
> Cr-Commit-Position: refs/heads/master@{#416923}

TBR=hiroshige@chromium.org,jkarlin@chromium.org,yhirano@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=643174

Review-Url: https://codereview.chromium.org/2319093004
Cr-Commit-Position: refs/heads/master@{#417338}