Move webrtc/audio_*.h to webrtc/api/call

BUG=webrtc:5878
NOTRY=True

Review-Url: https://codereview.webrtc.org/2059703002
Cr-Commit-Position: refs/heads/master@{#13996}
diff --git a/webrtc/media/BUILD.gn b/webrtc/media/BUILD.gn
index 78e7f78..df4e3d2 100644
--- a/webrtc/media/BUILD.gn
+++ b/webrtc/media/BUILD.gn
@@ -204,6 +204,7 @@
 
   deps += [
     "..:webrtc_common",
+    "../api:call_api",
     "../base:rtc_base_approved",
     "../call",
     "../libjingle/xmllite",