Mojo JS bindings: convert relative path to URL properly.

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

Index: mojo/public/interfaces/bindings/tests/echo_import.mojom
diff --git a/mojo/public/interfaces/bindings/tests/echo_import.mojom b/mojo/public/interfaces/bindings/tests/echo_import.mojom
deleted file mode 100644
index a024ce2ff16ff9ee0d0bd63f3964cf4bd409f81e..0000000000000000000000000000000000000000
--- a/mojo/public/interfaces/bindings/tests/echo_import.mojom
+++ /dev/null
@@ -1,10 +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_import.mojom;
-
-struct Point {
-  int32 x;
-  int32 y;
-};