Reduce reliance on getRevisionID() on DifferentialComment

Summary: Ref T2222. A few rendering interfaces rely on fishing the revision ID out of a DifferentialComment, but it will only have the PHID soon. Pass in the revision and use it to determine the ID instead.

Test Plan: Browsed, previewed, examined comments. Clicked anchors.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2222

Differential Revision: https://secure.phabricator.com/D8209

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -266,6 +266,7 @@ final class DifferentialRevisionViewController extends DifferentialController {
     $comment_view->setUser($user);
     $comment_view->setTargetDiff($target);
     $comment_view->setVersusDiffID($diff_vs);
+    $comment_view->setRevision($revision);
 
     if ($arc_project) {
       Javelin::initBehavior(