Add |RTCUIApplicationStatusObserver sharedInstance| call in ios test AppDelegate.

webrtc/test/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../webrtc.gni")
 import("//build/config/ui.gni")
@@ skipping 101 matching lines @@
 }
 
 if (is_ios) {
   rtc_source_set("test_support_objc") {
     testonly = true
     visibility = [ ":test_support" ]
     sources = [
       "ios/test_support.h",
       "ios/test_support.mm",
     ]
+    deps = [
+      "../sdk:common_objc",
+    ]
   }
 }
 
 rtc_source_set("test_support") {
   testonly = true
 
   sources = [
     "gmock.h",
     "gtest.h",
     "testsupport/packet_reader.cc",
@@ skipping 586 matching lines @@
     ]
     deps = [
       "../rtc_base:base_java",
       "//testing/android/native_test:native_test_java",
     ]
 
     # TODO(sakal): Fix build hooks crbug.com/webrtc/8148
     no_build_hooks = true
   }
 }