Split //ios/public/provider/chrome/browser/* targets.

ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn

Index: ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
diff --git a/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn b/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..130e0470e0f0eab79638ca20c9a2a92ec293faf1
--- /dev/null
+++ b/ios/public/provider/chrome/browser/native_app_launcher/BUILD.gn
@@ -0,0 +1,11 @@
+# Copyright 2016 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("native_app_launcher") {
+  sources = [
+    "native_app_metadata.h",
+    "native_app_types.h",
+    "native_app_whitelist_manager.h",
+  ]
+}