Hide the modified date for Team Drives

Hide the modified date for Team Drives, since it's always set to 1st Jan
1970. In a later patch, we will update it to the correct date.

Bug: 861622
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I7be57d16fedf62c07cb0eb7bf3e2e32cf01ccaf6
Reviewed-on: https://chromium-review.googlesource.com/1141459
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576362}

ui/file_manager/file_manager/foreground/js/metadata_box_controller.js

@@ -139,7 +139,7 @@ MetadataBoxController.prototype.onGeneralMetadataLoaded_ = function(
     this.setDirectorySize_(
         /** @type {!DirectoryEntry} */ (entry), isSameEntry);
   }
-  if (item.modificationTime) {
+  if (item.modificationTime && !util.isTeamDriveRoot(entry)) {
     this.metadataBox_.modificationTime =
         this.fileMetadataFormatter_.formatModDate(item.modificationTime);
   }

ui/file_manager/file_manager/foreground/js/ui/file_table.js

@@ -899,6 +899,13 @@ FileTable.prototype.renderDate_ = function(entry, columnId, table) {
  * @private
  */
 FileTable.prototype.updateDate_ = function(div, entry) {
+  // For now, Team Drive roots have the incorrect modified date value. Hide it
+  // until we get the proper one (see https://crbug.com/861622).
+  if (util.isTeamDriveRoot(entry)) {
+    div.textContent = '--';
+    return;
+  }
+
   var item = this.metadataModel_.getCache(
       [entry], ['modificationTime', 'modificationByMeTime'])[0];
   var modTime = this.useModificationByMeTime_ ?