Restructure public side of view_manager service.

mojo/services/public/cpp/view_manager/BUILD.gn

Index: mojo/services/public/cpp/view_manager/BUILD.gn
diff --git a/mojo/services/public/cpp/view_manager/BUILD.gn b/mojo/services/public/cpp/view_manager/BUILD.gn
deleted file mode 100644
index 14eb27d3fac0d17e2f5fa9083e3c572753db8aec..0000000000000000000000000000000000000000
--- a/mojo/services/public/cpp/view_manager/BUILD.gn
+++ /dev/null
@@ -1,47 +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.
-
-source_set("view_manager") {
-  sources = [
-    "lib/view.cc",
-    "lib/view_manager_client_factory.cc",
-    "lib/view_manager_client_impl.cc",
-    "lib/view_manager_client_impl.h",
-    "lib/view_manager_context.cc",
-    "lib/view_observer.cc",
-    "lib/view_private.cc",
-    "lib/view_private.h",
-    "view.h",
-    "view_manager.h",
-    "view_manager_client_factory.h",
-    "view_manager_context.h",
-    "view_manager_delegate.h",
-    "view_observer.h",
-    "view_property.h",
-    "view_tracker.cc",
-    "view_tracker.h",
-  ]
-
-  public_deps = [
-    ":common",
-  ]
-  deps = [
-    "//base",
-    "//mojo/public/c/gles2:headers",
-    "//mojo/public/cpp/application",
-    "//mojo/public/cpp/bindings:bindings",
-    "//mojo/public/interfaces/application",
-    "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/input_events:input_events",
-    "//mojo/services/public/interfaces/surfaces:surface_id",
-    "//mojo/services/public/interfaces/view_manager",
-    "//mojo/services/window_manager/public/interfaces",
-  ]
-}
-
-source_set("common") {
-  sources = [
-    "types.h",
-  ]
-}