Make //blimp/client/app a real embedder of //blimp/client/public

blimp/client/core/session/BUILD.gn

 # 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("session") {
   visibility = [
-    "//blimp/client/app:*",  # TODO(nyquist): Remove this. See crbug/651964.
     "//blimp/client/core/*",
     "//blimp/engine:browser_tests",  # TODO(nyquist): Remove this. See crbug/653789.
   ]
 
   sources = [
     "assignment_source.cc",
     "assignment_source.h",
     "client_network_components.cc",
     "client_network_components.h",
     "connection_status.cc",
@@ skipping 50 matching lines @@
     "//components/safe_json:test_support",
     "//net:test_support",
     "//url",
   ]
 
   data += [
     "test_selfsigned_cert.pem",
     "//blimp/test/data/test_client_token",
   ]
 }