[vr] Remove unused UiScene::HandleCommands

Change-Id: Ida32bb0de8bd78fae003abd39bce4ec327ad9317
Reviewed-on: https://chromium-review.googlesource.com/594549Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490791}

chrome/browser/vr/ui_scene.h

@@ -15,7 +15,6 @@
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace base {
-class ListValue;
 class TimeTicks;
 }  // namespace base
 
@@ -60,10 +59,6 @@ class UiScene {
   // frame lifecycle. After this function, no element should be dirtied.
   void PrepareToDraw();
 
-  // Handle a batch of commands passed from the UI HTML.
-  void HandleCommands(std::unique_ptr<base::ListValue> commands,
-                      const base::TimeTicks& current_time);
-
   const std::vector<std::unique_ptr<UiElement>>& GetUiElements() const;
 
   UiElement* GetUiElementById(int element_id) const;