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/remote_bitrate_estimator/test/bwe_test_framework.cc

@@ -16,6 +16,7 @@
 
 #include "rtc_base/constructormagic.h"
 #include "rtc_base/numerics/safe_minmax.h"
+#include "rtc_base/system/unused.h"
 
 namespace webrtc {
 namespace testing {

modules/remote_bitrate_estimator/test/bwe_test_framework.h

@@ -34,7 +34,6 @@
 #include "rtc_base/constructormagic.h"
 #include "rtc_base/random.h"
 #include "system_wrappers/include/clock.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 namespace webrtc {
 

modules/remote_bitrate_estimator/test/estimators/remb.cc

@@ -16,8 +16,8 @@
 #include "modules/remote_bitrate_estimator/remote_bitrate_estimator_abs_send_time.h"
 #include "modules/remote_bitrate_estimator/test/bwe_test_logging.h"
 #include "modules/rtp_rtcp/include/receive_statistics.h"
+#include "rtc_base/system/unused.h"
 #include "test/gtest.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 namespace webrtc {
 namespace testing {

modules/remote_bitrate_estimator/test/metric_recorder.cc

@@ -15,7 +15,7 @@
 #include <algorithm>
 
 #include "modules/remote_bitrate_estimator/test/packet_sender.h"
-#include "typedefs.h"  // NOLINT(build/include)
+#include "rtc_base/system/unused.h"
 
 namespace webrtc {
 namespace testing {