Fix compilation on linux
Fix compilation on linux

Original commit:

commit 8a62aea7a676b02ef09717aabd7b4213420893fc
Author: Dominic Mazzoni <dmazzoni@chromium.org>
Date:   Fri Sep 1 22:03:03 2017 +0000

    Fix win clang build

atom/libchromiumcontent,atom/libchromiumcontent,electron/libchromiumcontent,electron/libchromiumcontent