SurfaceAggregator should check whether output is secure when drawin

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index c60a95739ed9e2b4659c593234ba7ab4a94fd1f5..5ba10d7277a74e389e3f02fd81ff9cfc477461d0 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -590,12 +590,6 @@ class CC_EXPORT LayerTreeHostImpl
                                   bool is_direct_manipulation,
                                   ScrollTree* scroll_tree);
 
-  void set_output_is_secure(bool output_is_secure) {
-    output_is_secure_ = output_is_secure;
-  }
-
-  bool output_is_secure() const { return output_is_secure_; }
-
   base::SingleThreadTaskRunner* GetTaskRunner() const {
     DCHECK(task_runner_provider_);
     return task_runner_provider_->HasImplThread()
@@ -812,8 +806,6 @@ class CC_EXPORT LayerTreeHostImpl
   gfx::Rect viewport_rect_for_tile_priority_;
   bool resourceless_software_draw_;
 
-  bool output_is_secure_;
-
   gfx::Rect viewport_damage_rect_;
 
   std::unique_ptr<AnimationHost> animation_host_;