Update codereview.settings to Gerrit (dart-review.googlesource.com)

Bug:
Change-Id: Ib53ad94ca0d633ffceb692d5d1136475fef1f099
Reviewed-on: https://dart-review.googlesource.com/2860
Reviewed-by: Jonas Termansen <sortie@google.com>

Author: whesse

codereview.settings

@@ -1,5 +1,5 @@
 # This file is used by gcl to get repository specific information.
-GERRIT_HOST: False
-CODE_REVIEW_SERVER: http://codereview.chromium.org
-VIEW_VC: https://github.com/dart-lang/sdk/commit/
+GERRIT_HOST: True
+CODE_REVIEW_SERVER: https://dart-review.googlesource.com
+VIEW_VC: https://dart.googlesource.com/sdk/+
 CC_LIST: reviews@dartlang.org