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/g711/g711_interface.c b/modules/audio_coding/codecs/g711/g711_interface.c
index 3613507..5fe1692 100644
--- a/modules/audio_coding/codecs/g711/g711_interface.c
+++ b/modules/audio_coding/codecs/g711/g711_interface.c
@@ -12,7 +12,6 @@
 
 #include "modules/third_party/g711/g711.h"
 #include "modules/audio_coding/codecs/g711/g711_interface.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 size_t WebRtcG711_EncodeA(const int16_t* speechIn,
                           size_t len,
diff --git a/modules/audio_coding/codecs/g711/g711_interface.h b/modules/audio_coding/codecs/g711/g711_interface.h
index f206f30..83f9d37 100644
--- a/modules/audio_coding/codecs/g711/g711_interface.h
+++ b/modules/audio_coding/codecs/g711/g711_interface.h
@@ -11,7 +11,7 @@
 #ifndef MODULES_AUDIO_CODING_CODECS_G711_G711_INTERFACE_H_
 #define MODULES_AUDIO_CODING_CODECS_G711_G711_INTERFACE_H_
 
-#include "typedefs.h"  // NOLINT(build/include)
+#include <stdint.h>
 
 // Comfort noise constants
 #define G711_WEBRTC_SPEECH 1