Restoring check for CHROME_HEADLESS environment variable when initializing BreakPad.
Restoring check for CHROME_HEADLESS environment variable when initializing BreakPad.

BUG=chromium-os:8350
TEST=none

Review URL: http://codereview.chromium.org/5160003

git-svn-id: http://src.chromium.org/svn/trunk/src@66611 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e9399ee1b34abc494efdf7512f59996bbb987493
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser