Update .gitignore.
Update .gitignore.

TBR=phajdan.jr@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/12278004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@182758 0039d316-1c4b-4281-b951-d872f2087c98

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