Run git cl format --full on the C++ files in system_wrappers/

Specifically, this CL was generated by the following shell commands:

  cd system_wrappers
  for f in $(find . -type f | grep -E '[.](h|cc)$'); do echo >> $f; done
  git cl format --full

Followed by a revert of the changes to asm_defines.h since that file
is assembly and not C++, and a manual edit to clock.cc to add some
blank lines in the #include list to prevent `git cl format` from
sorting <MMSystem.h> before "rtc_base/win32.h".

I needed to do this because otherwise `git cl format` introduces a lot
of unrelated formatting changes in other CLs that move these files
(since `git cl format` will try to re-format all lines of a moved
file).

BUG=none

Change-Id: I083e23a57ce2899add3e60bbd539f03343c7c219
Reviewed-on: https://webrtc-review.googlesource.com/21161
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20600}

system_wrappers/source/event_timer_win.cc

@@ -24,8 +24,7 @@ EventTimerWin::EventTimerWin()
                            FALSE,   // manual reset
                            FALSE,   // initial state
                            NULL)),  // name of event
-    timerID_(NULL) {
-}
+      timerID_(NULL) {}
 
 EventTimerWin::~EventTimerWin() {
   StopTimer();