Fix buildbot upload to commondatastorage.

The buildbot masters now set BOTO_CONFIG and
AWS_CREDENTIAL_FILE which was breaking the upload
to nacl commondatastorage.

BUG=
R=binji@chromium.org

Review URL: https://codereview.chromium.org/18947002

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1563 050acbb0-2703-11df-ab0a-9f3f633ae91d
1 file changed