Mojo: Simplify typemap usage.

url/mojo/gurl.typemap

Index: url/mojo/gurl.typemap
diff --git a/url/mojo/gurl.typemap b/url/mojo/gurl.typemap
index ddd755b6162abcb91dc7cf447d9953c0f0a4d769..5ff785589839ff7a275a56adba173d0fff1a39ae 100644
--- a/url/mojo/gurl.typemap
+++ b/url/mojo/gurl.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.Url": {
-      "typename": "GURL",
-      "public_headers": [
-        "url/gurl.h"
-      ],
-      "traits_headers": [
-        "url/mojo/url_gurl_struct_traits.h"
-      ]
-    }
-  }
-}
+mojom = "//url/mojo/url.mojom"
+public_headers = [ "//url/gurl.h" ]
+traits_headers = [ "//url/mojo/url_gurl_struct_traits.h" ]
+deps = [
+  "//url",
+]
+type_mappings = [ "url.mojom.Url=GURL" ]