Set the user agent for 0.6

blimp/client/core/settings/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("settings") {
   visibility = [
     "//blimp/client/app:*",  # TODO(nyquist): Remove this. See crbug/651964.
     "//blimp/client/core/*",
   ]
 
   sources = [
     "blimp_settings_delegate.h",
     "settings.cc",
     "settings.h",
     "settings_feature.cc",
     "settings_feature.h",
     "settings_observer.h",
     "settings_prefs.cc",
     "settings_prefs.h",
+    "user_agent.cc",
+    "user_agent.h",
   ]
 
   deps = [
     "//blimp/client/core/switches",
     "//blimp/common",
     "//components/prefs",
     "//net",
   ]
 
   public_deps = [
@@ skipping 61 matching lines @@
   generate_jni("settings_jni_headers") {
     visibility = [ ":*" ]
 
     sources = [
       "android/java/src/org/chromium/blimp/core/settings/AboutBlimpPreferences.java",
     ]
 
     jni_package = "blimp/client/core/settings"
   }
 }