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

webrtc/audio/utility/BUILD.gn

 # Copyright (c) 2016 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/webrtc.gni")
 
 group("utility") {
   public_deps = [
     ":audio_frame_operations",
   ]
 }
 
 rtc_static_library("audio_frame_operations") {
   sources = [
     "audio_frame_operations.cc",
@@ skipping 18 matching lines @@
       "../../base:rtc_base_approved",
       "../../test:test_support",
       "//testing/gtest",
     ]
     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" ]
     }
   }
 }