Decoupling rtc_base from apple specific code [without cyclic deps]

webrtc/modules/audio_processing/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("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 739 matching lines @@
         "../../base:rtc_task_queue",
         "../../common_audio:common_audio",
         "../../system_wrappers",
         "../../system_wrappers:system_wrappers_default",
         "../../test:test_support",
         "aec_dump",
         "aec_dump:aec_dump_impl",
         "//testing/gtest",
         "//third_party/gflags:gflags",
       ]
+      if (is_ios) {
+        deps += [ "../../rtc_base:rtc_base_apple" ]
+      }
     }  # audioproc_f
   }
 
   rtc_source_set("audioproc_test_utils") {
     testonly = true
     sources = [
       "test/audio_buffer_tools.cc",
       "test/audio_buffer_tools.h",
       "test/performance_timer.cc",
       "test/performance_timer.h",
@@ skipping 23 matching lines @@
       ":audio_processing",
       "..:module_api",
       "../..:webrtc_common",
       "../../common_audio:common_audio",
       "../../system_wrappers:metrics_default",
       "../../system_wrappers:system_wrappers",
       "../../test:test_support",
       "//testing/gtest",
       "//third_party/gflags",
     ]
+    if (is_ios) {
+      deps += [ "../../rtc_base:rtc_base_apple" ]
+    }
   }
 
   rtc_executable("click_annotate") {
     testonly = true
     sources = [
       "transient/click_annotate.cc",
       "transient/file_utils.cc",
       "transient/file_utils.h",
     ]
     deps = [
@@ skipping 52 matching lines @@
 
       deps = [
         ":audioproc_debug_proto",
         "../..:webrtc_common",
         "../../base:protobuf_utils",
         "../../base:rtc_base_approved",
       ]
     }
   }
 }