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 35e4591fe15316ce56acaf2d8a52a45ee57bd503..ae0b86d7b3a9c0d05dda4ce24ea533d7f4a8f726 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -591,12 +591,6 @@ 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()
@@ -826,8 +820,6 @@ 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_;