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GetOriginsTask is ref counted, and its first reference is implicitly
retained by base::Bind() in GetOriginsTask::Run().
Though this case is safe, an upcoming base::Bind change rejects this
pattern of the first reference retention.

After this CL, the caller of GetOriginsTask::Run() keeps the first
reference to the GetOriginsTask instance to avoid the check failure.

Bug: 866456
Change-Id: Ia011ccc3b815a626200403b22c63b8133c83fbb0
Reviewed-on: https://chromium-review.googlesource.com/1158664
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579873}