Delete root header file typedef.h.

Usage replaced with stdint.h, rtc_base/system/arch.h and
rtc_base/system/unused.h, as appropriate.

Bug: webrtc:6854
Change-Id: I97225465d14b969903d92979e2df3c3c05d35f18
Reviewed-on: https://webrtc-review.googlesource.com/90249
Reviewed-by: Niklas Enbom <niklas.enbom@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24100}
diff --git a/modules/audio_coding/codecs/ilbc/cb_construct.h b/modules/audio_coding/codecs/ilbc/cb_construct.h
index b200990..f4df387 100644
--- a/modules/audio_coding/codecs/ilbc/cb_construct.h
+++ b/modules/audio_coding/codecs/ilbc/cb_construct.h
@@ -20,7 +20,10 @@
 #define MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_CB_CONSTRUCT_H_
 
 #include <stdbool.h>
+#include <stdint.h>
+
 #include "modules/audio_coding/codecs/ilbc/defines.h"
+#include "rtc_base/system/unused.h"
 
 /*----------------------------------------------------------------*
  *  Construct decoded vector from codebook and gains.