Explicitly specify default REPO_NAME and REPO_URL for Cronet recipe.
Explicitly specify default REPO_NAME and REPO_URL for Cronet recipe.

BUG=438711

Review URL: https://codereview.chromium.org/778833004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@293257 0039d316-1c4b-4281-b951-d872f2087c98

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