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

webrtc/sdk/BUILD.gn

 # Copyright 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")
 if (is_ios) {
   import("//build/config/ios/rules.gni")
 }
 
 group("sdk") {
   if (is_ios) {
     public_deps = [
       ":rtc_sdk_framework_objc",
     ]
   }
@@ skipping 372 matching lines @@
       deps += [ "$rtc_libyuv_dir" ]
       public_deps = [
         "$rtc_libyuv_dir",
       ]
     } else {
       # Need to add a directory normally exported by libyuv.
       include_dirs = [ "$rtc_libyuv_dir/include" ]
     }
   }
 }