Delete talk directory, and references from build_ios_libs.sh.

talk/app/webrtc/objc/RTCAudioTrack.mm

Index: talk/app/webrtc/objc/RTCAudioTrack.mm
diff --git a/talk/app/webrtc/objc/RTCAudioTrack.mm b/talk/app/webrtc/objc/RTCAudioTrack.mm
deleted file mode 100644
index 78635b6b8fef98c9a9bfed824df197c472351f8a..0000000000000000000000000000000000000000
--- a/talk/app/webrtc/objc/RTCAudioTrack.mm
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * libjingle
- * Copyright 2013 Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-#import "RTCAudioTrack+Internal.h"
-
-#import "RTCMediaStreamTrack+Internal.h"
-
-@implementation RTCAudioTrack
-@end
-
-@implementation RTCAudioTrack (Internal)
-
-- (rtc::scoped_refptr<webrtc::AudioTrackInterface>)audioTrack {
-  return static_cast<webrtc::AudioTrackInterface*>(self.mediaTrack.get());
-}
-
-@end