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Installing DLC prior to ListVms will cutdown the timeout cost of waiting
for PluginVm Dispatcher to startup, which it won't be able to if
PluginVM DLC is missing anyways.

BUG=b:154285573
TEST=./unit_tests && ./browser_tests # --gtest_filter=*Plugin*

Change-Id: Ib8de3a36bfb2b60d755f0457d3c289b8c71cca4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155053
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762113}