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This CL hooks up download progress notifications from the WinHTTP network
client up to AppInstall.

BUG: 1014590.

Change-Id: I18cc3276284a221a93f2d7ca05005eb1bf3dc71d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216035Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773284}