Make Gerrit the default code review for V8

Bug: chromium:685318
Change-Id: Ia603ad4a0a35bba5c5572cad32364ff3695b3a74
Reviewed-on: https://chromium-review.googlesource.com/558191
Commit-Queue: Aaron Gable <agable@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46368}

codereview.settings

+PROJECT: v8
+GERRIT_HOST: True
 CODE_REVIEW_SERVER: https://codereview.chromium.org
 CC_LIST: v8-reviews@googlegroups.com
 VIEW_VC: https://chromium.googlesource.com/v8/v8/+/
 STATUS: http://v8-status.appspot.com/status
-TRY_ON_UPLOAD: False
-TRYSERVER_SVN_URL: svn://svn.chromium.org/chrome-try-v8
-PROJECT: v8
-PENDING_REF_PREFIX: refs/pending/
 RUN_POST_UPLOAD_HOOK: True