Revert of Moving webrtc.gni up one level from build/

webrtc/common_audio/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("../webrtc.gni")
+import("../build/webrtc.gni")
 
 config("common_audio_config") {
   include_dirs = [
     "resampler/include",
     "signal_processing/include",
     "vad/include",
   ]
 }
 
 rtc_static_library("common_audio") {
@@ skipping 319 matching lines @@
       "//testing/gtest",
     ]
 
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
 
       shard_timeout = 900
     }
   }
 }