Delete rtc_base/basictypes.h

Only remaining user was rtc_base/byteorder.h, which is changed to use
rtc_base/system/arch.h.

Bug: webrtc:6853
Change-Id: If3b21831adc60adfd989061027d661867c938a0f
Reviewed-on: https://webrtc-review.googlesource.com/78740
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23406}
diff --git a/rtc_base/task_queue_win.cc b/rtc_base/task_queue_win.cc
index cbf86a6..5cc9f88 100644
--- a/rtc_base/task_queue_win.cc
+++ b/rtc_base/task_queue_win.cc
@@ -11,9 +11,8 @@
 #include "rtc_base/task_queue.h"
 
 // Include winsock2.h before including <windows.h> to maintain consistency with
-// win32.h.  We can't include win32.h directly here since it pulls in
-// headers such as basictypes.h which causes problems in Chromium where webrtc
-// exists as two separate projects, webrtc and libjingle.
+// win32.h. To include win32.h directly, it must be broken out into its own
+// build target.
 #include <winsock2.h>
 #include <windows.h>
 #include <sal.h>  // Must come after windows headers.