Remove the 'r' prefix from buildbot emails.
Remove the 'r' prefix from buildbot emails.

R=borenet@google.com

Review URL: https://codereview.chromium.org/25627005

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@11598 2bbb7eff-a529-9590-31e7-b0007b416f81

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot