Update .gitignore yet again.
Update .gitignore yet again.

These builders keep poping up.

TBR=szager@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/12252014

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@182289 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build