Video Player: refresh token when it looks expired

It should be refreshed but it was not by bug. This patch fixes this.

BUG=none
TEST=manual
TBR=fukino@chromium.org

Review URL: https://codereview.chromium.org/543103002

Cr-Commit-Position: refs/heads/master@{#293532}

ui/file_manager/video_player/js/cast/cast_video_element.js

@@ -329,7 +329,8 @@ CastVideoElement.prototype = {
     var message = JSON.parse(messageAsJson);
     if (message['message'] === 'request-token') {
       if (message['previousToken'] === this.token_) {
-          this.mediaManager_.getToken().then(function(token) {
+          this.mediaManager_.getToken(true).then(function(token) {
+            this.token_ = token;
             this.sendMessage_({message: 'push-token', token: token});
             // TODO(yoshiki): Revokes the previous token.
           }.bind(this)).catch(function(error) {