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

blimp/client/core/context/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("context") {
   visibility = [
     ":unit_tests",
-    "//blimp/client/app:session",  # TODO(nyquist): Remove this. See crbug/651964.
     "//blimp/client/core",
     "//blimp/client/core/integration_tests",
     "//blimp/engine:browser_tests",  # TODO(nyquist): Remove this. See crbug/653789.
   ]
 
   sources = [
     "assignment_fetcher.cc",
     "assignment_fetcher.h",
     "blimp_client_context_impl.cc",
     "blimp_client_context_impl.h",
@@ skipping 119 matching lines @@
   generate_jni("dummy_context_jni_headers") {
     visibility = [ ":*" ]
 
     sources = [
       "android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java",
     ]
 
     jni_package = "blimp/client/core"
   }
 }