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In order to be able to revert to extension after autogenerated theme
is installed the extensions should be disabled.

Change-Id: I63e2bcd4b82c804039e9868e107a936c155dfd64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623502Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669125}