Use .gclient.svn if .gclient is missing to fix bots that failed half-way
Use .gclient.svn if .gclient is missing to fix bots that failed half-way

R=dnj@chromium.org
BUG=498256, 530194
TEST=ran locally after moving .gclient to .gclient.svn in /b

Review URL: https://codereview.chromium.org/1340643002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@296649 0039d316-1c4b-4281-b951-d872f2087c98

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