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On browser startup we attempt to resume all previously active fetches.
The DownloadService might not be ready though, so this change only resumes
the fetches if the DownloadService is ready, and also goes through all the
jobs and resumes the active fetches once the OnServiceInitialized event
is triggered.

Note that ResumeDownload might be called twice on the same guid in some cases,
but that will not cause any problems since the second call will be ignored.

Change-Id: I1d06c944496cd0f1b711ae91d15c003abc70f8c3
Reviewed-on: https://chromium-review.googlesource.com/1152820
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578664}