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}

modules/audio_processing/ns/noise_suppression.h

@@ -12,8 +12,7 @@
 #define MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_H_
 
 #include <stddef.h>
-
-#include "typedefs.h"  // NOLINT(build/include)
+#include <stdint.h>
 
 typedef struct NsHandleT NsHandle;
 

modules/audio_processing/ns/noise_suppression_x.h

@@ -12,8 +12,7 @@
 #define MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_X_H_
 
 #include <stddef.h>
-
-#include "typedefs.h"  // NOLINT(build/include)
+#include <stdint.h>
 
 typedef struct NsxHandleT NsxHandle;
 

modules/audio_processing/ns/nsx_core.h

@@ -17,7 +17,6 @@
 
 #include "common_audio/signal_processing/include/signal_processing_library.h"
 #include "modules/audio_processing/ns/nsx_defines.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 typedef struct NoiseSuppressionFixedC_ {
   uint32_t fs;