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extensions::ContentVerifyJob is ref counted, and its first reference may
be implicitly created in ContentVerifyJob::Start through base::BindOnce.
However, after an upcoming change to base::Bind, it starts rejecting to
make the implicit first reference to a ref-counted object, as this is
an error prone pattern.

This CL updates callers of ContentVerifyJob::Start to hold to hold the
first reference, before Start() is called.

Bug: 866456
Change-Id: Ib3a70973ac789f60a75e636db03f4e4d66e12603
Reviewed-on: https://chromium-review.googlesource.com/1156704Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579653}