Decoupling rtc_base from apple specific code [without cyclic deps]

webrtc/audio/BUILD.gn

 # Copyright (c) 2015 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")
 if (is_android) {
@@ skipping 113 matching lines @@
       data = [
         "../../resources/voice_engine/audio_tiny16.wav",
         "../../resources/voice_engine/audio_tiny48.wav",
         "../../resources/voice_engine/audio_dtx16.wav",
       ]
 
       if (!build_with_chromium && is_clang) {
         # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163)
         suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
       }
+      if (is_ios) {
+        deps += [ "../rtc_base:rtc_base_apple" ]
+      }
     }
   }
 
   rtc_source_set("audio_perf_tests") {
     testonly = true
 
     # Skip restricting visibility on mobile platforms since the tests on those
     # gets additional generated targets which would require many lines here to
     # cover (which would be confusing to read and hard to maintain).
     if (!is_android && !is_ios) {
@@ skipping 19 matching lines @@
     data = [
       "//resources/voice_engine/audio_dtx16.wav",
     ]
 
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }