Test VS addin against pepper 27 and 28.

Previously we were testing against 23 and 24 which are now
very old.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/16875003

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1555 050acbb0-2703-11df-ab0a-9f3f633ae91d
diff --git a/buildbot_run.py b/buildbot_run.py
index f8b28dd..9e23251 100755
--- a/buildbot_run.py
+++ b/buildbot_run.py
@@ -20,7 +20,7 @@
 GSURL = 'https://commondatastorage.googleapis.com'
 GSPATH = 'nativeclient-mirror/nacl/nacl_sdk/sdk'
 SDKROOT = os.path.join('..', '..', 'out', 'sdk')
-SDK_VERSIONS = ['pepper_23', 'pepper_24', 'pepper_canary']
+SDK_VERSIONS = ['pepper_27', 'pepper_28', 'pepper_canary']
 
 
 def Log(msg):