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When web apps are uninstalled and the clear site data option is
selected, the |web_app| object was being accessed after uninstallation
was completed, causing a DCHECK failure. This CL rearranges the call to
clear site data so that its origin is computed before uninstallation.

BUG=1084394

Change-Id: Iab3705096f5658cc30e2aa08c43d56247281cf5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208156Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770009}