Set the right product type in GN for mac bundle targets.

build/config/mac/rules.gni

 # Copyright 2015 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/mac/base_rules.gni")
 
 # Generates Info.plist files for Mac apps and frameworks.
 #
 # Arguments
 #
@@ skipping 278 matching lines @@
                              "public_deps",
                              "testonly",
                            ])
     if (!defined(deps)) {
       deps = []
     }
     deps += [
       ":$_executable_bundle_data",
       ":$_info_plist_bundle_data",
     ]
-
+    product_type = "com.apple.product-type.application"

[sdefresne, 2016/06/06 14:26:40]

nit: can you restore the blank line you removed?

     bundle_root_dir = "$root_out_dir/${_output_name}.app/Contents"
     bundle_resources_dir = "$bundle_root_dir/Resources"
     bundle_executable_dir = "$bundle_root_dir/MacOS"
   }
 }
 
 # Template to package a loadable_module into a .plugin bundle.
 #
 # This takes no extra arguments that differ from a loadable_module.
 template("mac_plugin_bundle") {
@@ skipping 48 matching lines @@
                            ])
     if (!defined(deps)) {
       deps = []
     }
     deps += [ ":$_loadable_module_bundle_data" ]
 
     bundle_root_dir = "$root_out_dir/$_output_name.plugin/Contents"
     bundle_executable_dir = "$bundle_root_dir/MacOS"
   }
 }