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CL [1] propagates the FONTCONFIG_FILE environment variable to subprocesses and
thus ensures, child/utility processes receive the correct fontconfig testing
environment.  This means adding a command line switch to indicate a testing
environment for fontconfig is no longer necessary.

R=drott,thestig
BUG=849923

Change-Id: I2234802904e9f725fa0b221fd65aced4885e0023
Reviewed-on: https://chromium-review.googlesource.com/1112768
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570263}