Cleanup GN BUILD files, gni's and imports.

components/view_manager/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("//build/config/ui.gni")
 import("//testing/test.gni")
-import("//third_party/mojo/src/mojo/public/mojo_application.gni")
+import("//mojo/public/mojo_application.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 
   group("view_manager") {
     deps = [
       ":jni_headers",
       ":lib",
       ":loader",
@@ skipping 204 matching lines @@
     "//base/test:test_config",
     "//components/view_manager/public/cpp",
     "//components/view_manager/public/interfaces",
     "//mojo/application/public/cpp:test_support",
     "//ui/mojo/geometry:interfaces",
     "//ui/mojo/geometry:util",
   ]
 
   data_deps = [ ":view_manager" ]
 }