GitLab

This is a first, very small step towards making NaCl work in app_shell.

BUG=400577
TEST=compiles
TBR=brettw@chromium.org for moving a few lines out of chrome/common/BUILD.gn into extensions/common/BUILD.gn

Review URL: https://codereview.chromium.org/435343002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288136 0039d316-1c4b-4281-b951-d872f2087c98