GitLab

* TimeDelta::InMicrosecondsF() actually returns a double
* Shorten code

Bug: none
Change-Id: I0dc35be9c2298e79d8a8f0cd34492d09c04cf9c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359002
Commit-Queue: Sergey Volk <servolk@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798478}