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CompleteInitialization can be posted at a place after DeleteSoon's
task, and it can potentially cause a UAF crash. This happens only on
browser's shutdown sequence, and it won't practically. But just in case
and to make ASAN bots happy:)

Bug: 880665, 672793
Change-Id: I8435290b4df7068d456368624935d3007a2c52d7
Reviewed-on: https://chromium-review.googlesource.com/1238297
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594667}