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

webrtc/video/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/webrtc.gni")
+import("../webrtc.gni")
 
 rtc_static_library("video") {
   sources = [
     "call_stats.cc",
     "call_stats.h",
     "encoder_rtcp_feedback.cc",
     "encoder_rtcp_feedback.h",
     "overuse_frame_detector.cc",
     "overuse_frame_detector.h",
     "payload_router.cc",
@@ skipping 195 matching lines @@
     ]
     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" ]
     }
     if (rtc_use_h264) {
       defines += [ "WEBRTC_USE_H264" ]
     }
   }
 }