Mojo: Simplify typemap usage.

url/mojo/origin.typemap

Index: url/mojo/origin.typemap
diff --git a/url/mojo/origin.typemap b/url/mojo/origin.typemap
index e785ae4b53bfad181659741ecb98a360ec38ef5c..f18bd5ac6481d1202137c80b8598410bb3094932 100644
--- a/url/mojo/origin.typemap
+++ b/url/mojo/origin.typemap
@@ -1,17 +1,11 @@
-// Copyright 2016 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.
+# Copyright 2016 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.
 
-{
-  "c++": {
-    "url.mojom.Origin": {
-      "typename": "url::Origin",
-      "public_headers": [
-        "url/origin.h"
-      ],
-      "traits_headers": [
-        "url/mojo/origin_struct_traits.h"
-      ]
-    }
-  }
-}
+mojom = "//url/mojo/origin.mojom"
+public_headers = [ "//url/origin.h" ]
+traits_headers = [ "//url/mojo/origin_struct_traits.h" ]
+deps = [
+  "//url",
+]
+type_mappings = [ "url.mojom.Origin=url::Origin" ]