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

webrtc/sdk/android/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/webrtc.gni")
+import("//webrtc/build/webrtc.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 config("libjingle_peerconnection_jni_warnings_config") {
   # The warnings below are enabled by default. Since GN orders compiler flags
   # for a target before flags from configs, the only way to disable such
   # warnings is by having them in a separate config, loaded from the target.
   if (!is_win) {
     cflags = [
       "-Wno-sign-compare",
@@ skipping 210 matching lines @@
       "//third_party/android_support_test_runner:runner_java",
       "//third_party/junit",
       "//webrtc/base:base_java",
       "//webrtc/sdk/android:libjingle_peerconnection_java",
       "//webrtc/sdk/android:libjingle_peerconnection_metrics_default_java",
     ]
 
     shared_libraries = [ "//webrtc/sdk/android:libjingle_peerconnection_so" ]
   }
 }