GN: Changes for vp9, opus and direct trace

Corresponding GN changes for
https://webrtc-codereview.appspot.com/34099004/

BUG=4185
R=brettw@chromium.org

Review URL: https://webrtc-codereview.appspot.com/40669004

Cr-Commit-Position: refs/heads/master@{#8377}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8377 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index f4952a7..2577f34 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -718,7 +718,7 @@
     configs += [ "../..:common_config" ]
     public_configs = [ "../..:common_inherited_config" ]
 
-    deps += [ "//third_party/opus" ]
+    deps += [ rtc_opus_dir ]
   }
 }
 
@@ -806,7 +806,7 @@
     ":neteq_config",
   ]
 
-  forward_dependent_configs_from = [ "//third_party/opus" ]
+  forward_dependent_configs_from = [ rtc_opus_dir ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
@@ -825,6 +825,6 @@
     ":pcm16b",
     "../../common_audio",
     "../../system_wrappers",
-    "//third_party/opus",
+    rtc_opus_dir,
   ]
 }