Moving webrtc.gni up one level from build/

BUG=webrtc:7030

Review-Url: https://codereview.webrtc.org/2651543003
Cr-Commit-Position: refs/heads/master@{#16241}
diff --git a/webrtc/modules/audio_coding/audio_coding.gni b/webrtc/modules/audio_coding/audio_coding.gni
index 13577f8..0f3a75f 100644
--- a/webrtc/modules/audio_coding/audio_coding.gni
+++ b/webrtc/modules/audio_coding/audio_coding.gni
@@ -6,7 +6,7 @@
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
-import("../../build/webrtc.gni")
+import("../../webrtc.gni")
 
 audio_codec_defines = []
 if (rtc_include_ilbc) {