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LogEvent computes the time between the current event and navigation
start. It gets the navigation start time from WebPerformance::
NavigationStart() which is a wall time (i.e. base::Time), but before
this CL, it got the current time from base::TimeTicks::Now(). This CL
fixes that by using base::Time::Now() instead and also cleans up the
code a bit.

I believe this is a pure cleanup, though I'm not entirely sure if the
old way always delivered well-defined results.

Bug: 777568
Change-Id: I81ed3e1fae2650a6bbc053ae8a4917a8e6c91f5e
Reviewed-on: https://chromium-review.googlesource.com/776854
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517866}