Greyed out some icons, removed colors from Phriction updates

Summary:
@chad The colors were indeed terrible. Why didn't you tell me

Also greyed out diff icons when no diff available. Makes it more clear that you can't click it on mobile.

Test Plan: Saw it on mobile and desktop.

Reviewers: epriestley, chad

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5694

src/applications/phriction/controller/PhrictionListController.php

@@ -163,11 +163,9 @@ final class PhrictionListController
     switch ($content->getChangeType()) {
       case PhrictionChangeType::CHANGE_DELETE:
         $change_type = pht('%s deleted %s', $author, $document_link);
-        $color = 'red';
         break;
       case PhrictionChangeType::CHANGE_EDIT:
         $change_type = pht('%s edited %s', $author, $document_link);
-        $color = 'blue';
         break;
       case PhrictionChangeType::CHANGE_MOVE_HERE:
       case PhrictionChangeType::CHANGE_MOVE_AWAY:
@@ -180,11 +178,9 @@ final class PhrictionListController
         if ($change_type == PhrictionChangeType::CHANGE_MOVE_HERE) {
           $change_type = pht('%s moved %s from %s', $author, $document_link,
             $ref_doc_link);
-          $color = 'yellow';
         } else {
           $change_type = pht('%s moved %s to %s', $author, $document_link,
             $ref_doc_link);
-          $color = 'orange';
         }
         break;
       default:
@@ -194,7 +190,6 @@ final class PhrictionListController
 
     $item = id(new PhabricatorObjectItemView())
       ->setHeader($change_type)
-      ->setBarColor($color)
       ->addAttribute(phabricator_datetime($content->getDateCreated(), $user))
       ->addAttribute($slug_uri);
 
@@ -207,7 +202,7 @@ final class PhrictionListController
       $uri = $diff_uri->alter('l', $version - 1)->alter('r', $version);
       $item->addIcon('history', pht('View Change'), $uri);
     } else {
-      $item->addIcon('history', pht('No diff available'));
+      $item->addIcon('history-grey', pht('No diff available'));
     }
 
     return $item;