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If Plugin VM was installed prior to DLC support being added, PluginVM will fail to launch as the rootfs components will be removed.

This CL updates the launch flow to attempt installing the Plugin VM DLC if the dispatcher fails to launch.
This also allows us to recover from unexpected errors where the DLC module might get uninstalled or fail to be updated.

BUG=b:150867372
TEST=out/Default/unit_tests && out/Default/browser_tests # with PluginVM filters

Change-Id: I9ed6287bf1a35d38778003e8f629166fa5b8dfc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090619
Auto-Submit: Jae Hoon Kim <kimjae@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748093}