when build/linux/unbundle is used.
Previously gyp files would contain a giant conditional sections depending on use_system_foo condition. After extracting that to build/linux/unbundle, the nesting depth got reduced by one level, so one less "+" in this .gypi file (otherwise the section does not get applied at all).
BUG=226860
R=rsleevi@chromium.org
Review URL: https://codereview.chromium.org/14806002
git-svn-id: http://src.chromium.org/svn/trunk/src/build@197955 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
phajdan.jr@chromium.org