Revert of [inspector] fix timestamp formatting with non C locales (patchset #7 id:120001 of https://codereview.chromium.org/2410933002/ )

Reason for revert:
Breaks layout tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10548

See also:
https://github.com/v8/v8/wiki/Blink-layout-tests

Original issue's description:
> [inspector] fix timestamp formatting with non C locales
>
> If current locale has "," as decimal separator then message for consoleAPICalled will be corrupted.
>
> BUG=chromium:653424
> R=dgozman@chromium.org
>
> Committed: https://crrev.com/dde5ef75cbac1eb7e2dae59b246e4a0d0ba6a0f4
> Cr-Commit-Position: refs/heads/master@{#40190}

TBR=dgozman@chromium.org,kozyatinskiy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:653424

Review-Url: https://codereview.chromium.org/2419453002
Cr-Commit-Position: refs/heads/master@{#40200}