GN: Cleanup no longer needed libvpx config.

The includes this config provided are now
present just by depending on libvpx.

R=tfarina@chromium.org

Review URL: https://webrtc-codereview.appspot.com/44949004

Cr-Original-Commit-Position: refs/heads/master@{#8884}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6b3ccfc6a6e32edba3786f011dc4096eeaf0c68c
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index b10b528..4bcbe29 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -165,10 +165,6 @@
     ]
   }
 
-  # TODO(kjellander): Remove once libvpx has changed it's libvpx_config to be
-  # in direct_dependent_configs.
-  configs += [ "$rtc_libvpx_dir:libvpx_config" ]
-
   deps = [
     ":video_coding_utility",
     "../..:webrtc_common",
@@ -202,10 +198,6 @@
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 
-  # TODO(kjellander): Remove once libvpx has changed it's libvpx_config to be
-  # in direct_dependent_configs.
-  configs += [ "$rtc_libvpx_dir:libvpx_config" ]
-
   deps = [
     ":video_coding_utility",
     "../../common_video",