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}

rtc_tools/BUILD.gn

@@ -147,7 +147,6 @@ if (!build_with_chromium) {
 
     deps = [
       "..:webrtc_common",
-      "../:typedefs",
       "../common_video",
     ]
   }
@@ -371,7 +370,6 @@ if (rtc_include_tests) {
 
       deps = [
         "..:webrtc_common",
-        "../:typedefs",
         "../common_audio",
         "../modules/audio_processing",
         "../modules/audio_processing:audioproc_debug_proto",

rtc_tools/frame_editing/frame_editing_lib.cc

@@ -16,7 +16,6 @@
 
 #include "common_video/libyuv/include/webrtc_libyuv.h"
 #include "rtc_tools/frame_editing/frame_editing_lib.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 namespace webrtc {
 

rtc_tools/unpack_aecdump/unpack.cc

@@ -22,7 +22,6 @@
 #include "rtc_base/flags.h"
 #include "rtc_base/format_macros.h"
 #include "rtc_base/ignore_wundef.h"
-#include "typedefs.h"  // NOLINT(build/include)
 
 RTC_PUSH_IGNORING_WUNDEF()
 #include "modules/audio_processing/debug.pb.h"