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It's possible for the extension ID to be unset on the
EventPageRequestManager while requests are incoming for the event page.
In that case, avoid calling into extensions::ProcessManager to wake the
event page with an empty extension ID.

Bug: 1105702
Change-Id: I9017c0c6af7697fb0ac3d82fcb4e49d261993884
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446712Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814331}