[Reland 1] Pepper takes ownership of a mailbox before passing it to the texture layer.

cc/layers/texture_layer.h

Index: cc/layers/texture_layer.h
diff --git a/cc/layers/texture_layer.h b/cc/layers/texture_layer.h
index 4fa239f83afc4e750ec95259f301fbb81fcf4aa8..2d5b6bbb4af18f460491a450b0d5c6edabc89bc8 100644
--- a/cc/layers/texture_layer.h
+++ b/cc/layers/texture_layer.h
@@ -133,12 +133,6 @@ class CC_EXPORT TextureLayer : public Layer {
       const TextureMailbox& mailbox,
       std::unique_ptr<SingleReleaseCallback> release_callback);
 
-  // Use this for special cases where the same texture is used to back the
-  // TextureLayer across all frames.
-  // WARNING: DON'T ACTUALLY USE THIS WHAT YOU ARE DOING IS WRONG.
-  // TODO(danakj): Remove this when pepper doesn't need it. crbug.com/350204
-  void SetTextureMailboxWithoutReleaseCallback(const TextureMailbox& mailbox);
-
   void SetNeedsDisplayRect(const gfx::Rect& dirty_rect) override;
 
   void SetLayerTreeHost(LayerTreeHost* layer_tree_host) override;