First cut at "content handling" support in Mojo.

mojo/services/public/interfaces/content_handler/BUILD.gn

 # Copyright 2014 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
-# GYP version: mojo/mojo_services.gypi:mojo_navigation_bindings
-mojom("navigation") {
+# GYP version: mojo/mojo_services.gypi:mojo_content_handler_bindings
+mojom("content_handler") {
   sources = [
-    "navigation.mojom",
+    "content_handler.mojom",
   ]
 
   deps = [
     "//mojo/services/public/interfaces/network",
   ]
 }