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On Linux, given sufficient RAM, GetMaxRendererProcessCount() can now
return a value as high as (RLIMIT_NPROC / 2), instead of being capped to
a hard-coded maximum. This lets the browser start more processes and
have more process isolation between renderers if the environment can
support it.

This also makes the browser behave better when running in an environment
that is constrained by the process limit.

BUG=104689

Change-Id: I2b249bc4b1e1c2e52579cf6fd603798f3e028249
Reviewed-on: https://chromium-review.googlesource.com/c/1088242
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626313}