GitLab

Fix CrExtensionsManagerTestWithMultipleExtensionTypesInstalled.* to
pass on Mac 10.13 with --disable-blink-features=HTMLImports

Reproduced test failure locally on Mac 10.13, and verified test passes
with fix.

Bug: 925517
Change-Id: I8cabf2fccc3c4a1660373d65d203854e1234664c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604204Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658728}