Restructure public side of content_handler service.

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

Index: mojo/services/public/interfaces/content_handler/BUILD.gn
diff --git a/mojo/services/public/interfaces/content_handler/BUILD.gn b/mojo/services/public/interfaces/content_handler/BUILD.gn
deleted file mode 100644
index 5c542766514dd16d56dba31e96d89a2fdbef4bc9..0000000000000000000000000000000000000000
--- a/mojo/services/public/interfaces/content_handler/BUILD.gn
+++ /dev/null
@@ -1,16 +0,0 @@
-# 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")
-
-mojom("content_handler") {
-  sources = [
-    "content_handler.mojom",
-  ]
-
-  deps = [
-    "//mojo/public/interfaces/application",
-    "//mojo/services/network/public/interfaces",
-  ]
-}