Revert of [inspector] Turn on inspector by default (patchset #1 id:1 of https://codereview.chromium.org/2395763002/ )

Reason for revert:
Has test failures on windows and blocks landing a test driver fix.

Original issue's description:
> [inspector] Turn on inspector by default
>
> BUG=chromium:635948
>
> Committed: https://crrev.com/8146402c69044affff0e95f9641eee532fb70312
> Cr-Commit-Position: refs/heads/master@{#40380}

TBR=kozyatinskiy@chromium.org,dgozman@chromium.org,yangguo@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:635948

Review-Url: https://chromiumcodereview.appspot.com/2430223003
Cr-Commit-Position: refs/heads/master@{#40422}