Stop using LOG macros in favor of RTC_ prefixed macros.

This CL has been generated with the following script:

for m in PLOG \
  LOG_TAG \
  LOG_GLEM \
  LOG_GLE_EX \
  LOG_GLE \
  LAST_SYSTEM_ERROR \
  LOG_ERRNO_EX \
  LOG_ERRNO \
  LOG_ERR_EX \
  LOG_ERR \
  LOG_V \
  LOG_F \
  LOG_T_F \
  LOG_E \
  LOG_T \
  LOG_CHECK_LEVEL_V \
  LOG_CHECK_LEVEL \
  LOG
do
  git grep -l $m | xargs sed -i "s,\b$m\b,RTC_$m,g"
done
git checkout rtc_base/logging.h
git cl format

Bug: webrtc:8452
Change-Id: I1a53ef3e0a5ef6e244e62b2e012b864914784600
Reviewed-on: https://webrtc-review.googlesource.com/21325
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20617}
diff --git a/audio/audio_state.cc b/audio/audio_state.cc
index 9b5f74f..14a86e5 100644
--- a/audio/audio_state.cc
+++ b/audio/audio_state.cc
@@ -63,7 +63,7 @@
 }
 
 void AudioState::SetPlayout(bool enabled) {
-  LOG(INFO) << "SetPlayout(" << enabled << ")";
+  RTC_LOG(INFO) << "SetPlayout(" << enabled << ")";
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   const bool currently_enabled = (null_audio_poller_ == nullptr);
   if (enabled == currently_enabled) {
@@ -85,7 +85,7 @@
 }
 
 void AudioState::SetRecording(bool enabled) {
-  LOG(INFO) << "SetRecording(" << enabled << ")";
+  RTC_LOG(INFO) << "SetRecording(" << enabled << ")";
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   // TODO(henrika): keep track of state as in SetPlayout().
   VoEBase* const voe = VoEBase::GetInterface(voice_engine());