Update the UI examples.

examples/pdf_viewer/BUILD.gn

Index: examples/pdf_viewer/BUILD.gn
diff --git a/examples/pdf_viewer/BUILD.gn b/examples/pdf_viewer/BUILD.gn
deleted file mode 100644
index 58bf26e83b78a349f21bfdd0d25d374c22fcd886..0000000000000000000000000000000000000000
--- a/examples/pdf_viewer/BUILD.gn
+++ /dev/null
@@ -1,26 +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/mojo_application.gni")
-
-mojo_native_application("pdf_viewer") {
-  sources = [
-    "pdf_viewer.cc",
-  ]
-
-  deps = [
-    "//examples/bitmap_uploader",
-    "//mojo/application",
-    "//mojo/application:content_handler",
-    "//mojo/data_pipe_utils",
-    "//mojo/public/cpp/bindings",
-    "//mojo/public/cpp/utility",
-    "//mojo/services/content_handler/interfaces",
-    "//mojo/services/input_events/interfaces",
-    "//mojo/services/network/interfaces",
-    "//mojo/services/view_manager/cpp",
-    "//third_party/pdfium",
-    "//v8",
-  ]
-}