Revert of Mojo JS bindings: change module loading solution.

mojo/public/interfaces/bindings/tests/echo.mojom

Index: mojo/public/interfaces/bindings/tests/echo.mojom
diff --git a/mojo/public/interfaces/bindings/tests/echo.mojom b/mojo/public/interfaces/bindings/tests/echo.mojom
deleted file mode 100644
index 56c6063010588c7c9b896ddb6754c61cf302fcc4..0000000000000000000000000000000000000000
--- a/mojo/public/interfaces/bindings/tests/echo.mojom
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-module test.echo.mojom;
-
-import "echo_import.mojom";
-
-interface Echo {
-  EchoPoint(test.echo_import.mojom.Point point)
-      => (test.echo_import.mojom.Point result);
-};