chrome://dino fix bug where the dino doesn't stop flashing.

Bug happens on the rare occasion that bdayFlashTimer == 0, the dino
keeps on flashing and bday mode never gets set.

Bug: 846473
Change-Id: Iddbe3f9fdba49c540930aac1721cb76a2b137af6
Reviewed-on: https://chromium-review.googlesource.com/1109501Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Edward Jung <edwardjung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569247}

components/neterror/resources/offline.js

@@ -541,7 +541,7 @@ Runner.prototype = {
     var deltaTime = now - (this.time || now);
 
     // Flashing.
-    if (this.bdayFlashTimer) {
+    if (this.bdayFlashTimer != null) {
       if (this.bdayFlashTimer <= 0) {
         this.bdayFlashTimer = null;
         this.tRex.setFlashing(false);
@@ -865,6 +865,7 @@ Runner.prototype = {
       this.tRex.reset();
       this.playSound(this.soundFx.BUTTON_PRESS);
       this.invert(true);
+      this.bdayFlashTimer = null;
       this.update();
     }
   },