Replace test_support_main by test_main and get rid of test_support_main_threaded_mac

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")
 
@@ skipping 169 matching lines @@
       }
 
       deps = [
         ":video_capture_internal_impl",
         ":video_capture_module",
         "../../system_wrappers:system_wrappers_default",
         "../../test:video_test_common",
         "../utility",
         "//testing/gtest",
       ]
-      deps += [ "//webrtc/test:test_support_main" ]
+      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" ]
       }
     }
   }
 }