Remove backup glog calls for Info and Debug messages
Remove backup glog calls for Info and Debug messages

Cloud Logging seems pretty stable.  We keep in warnings and errors, as
those should be less frequent and cheap to backup.

Info and debug logs can get quite verbose and chew up uneeded disk space.

Bug: skia:
Change-Id: I07b3b2ae97922f651c195836c5401ca490f50f4d
Reviewed-on: https://skia-review.googlesource.com/43642
Reviewed-by: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

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