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RulesRegistryService posts tasks to the IO thread which access
ExtensionWebRequestEventRouter::GetInstance().
ExtensionWebRequestEventRouter accesses ExtensionsAPIClient::Get(),
which used to be destroyed before the tasks could run in some
situations. This change moves destruction of ExtensionsAPIClient
to ShellBrowserMainParts::PostDestroyThreads(), which should be
safe since tasks will no longer run at that time.

Bug: 866904
Change-Id: I974d474d08ff9d7c0c727a7c95d26f04363ce7f0
Reviewed-on: https://chromium-review.googlesource.com/1194579
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587343}