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

webrtc/modules/video_capture/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")
 
 # Note this target is missing an implementation for the video capture.
 # Targets must link with either 'video_capture' or
 # 'video_capture_internal_impl' depending on whether they want to
 # use the internal capturer.
 rtc_static_library("video_capture_module") {
   sources = [
     "device_info_impl.cc",
     "device_info_impl.h",
     "video_capture.h",
@@ skipping 175 matching lines @@
       ]
       deps += [ "//webrtc/test:test_main" ]
 
       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" ]
       }
     }
   }
 }