rename rebaseline_server JSON constants to be more consistent
(no behavioral change, no change to JSON file format)

(SkipBuildbotRuns)
NOTREECHECKS=True
NOTRY=True
R=rmistry@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/287473002

git-svn-id: http://skia.googlecode.com/svn/trunk@14701 2bbb7eff-a529-9590-31e7-b0007b416f81
13 files changed