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AppService doesn't have the extensions information, so the tilte for
extensions on shelf is empty when launch extensions.

Modify LauncherControllerHelper::GetAppTitle. If the app can't be found
from AppService, call extensions to get the title.

BUG=1059732

Change-Id: Ib2766671e85c049c17c98f0a524e79f457706979
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096416Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748913}