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/media/engine/simulcast.cc b/media/engine/simulcast.cc
index f2b3c3a..c2ac2d5 100644
--- a/media/engine/simulcast.cc
+++ b/media/engine/simulcast.cc
@@ -149,14 +149,14 @@
 bool SlotSimulcastMaxResolution(size_t max_layers, int* width, int* height) {
   int index = FindSimulcastFormatIndex(*width, *height, max_layers);
   if (index == -1) {
-    LOG(LS_ERROR) << "SlotSimulcastMaxResolution";
+    RTC_LOG(LS_ERROR) << "SlotSimulcastMaxResolution";
     return false;
   }
 
   *width = kSimulcastFormats[index].width;
   *height = kSimulcastFormats[index].height;
-  LOG(LS_INFO) << "SlotSimulcastMaxResolution to width:" << *width
-               << " height:" << *height;
+  RTC_LOG(LS_INFO) << "SlotSimulcastMaxResolution to width:" << *width
+                   << " height:" << *height;
   return true;
 }
 
@@ -300,8 +300,9 @@
   ScreenshareLayerConfig config(kScreenshareDefaultTl0BitrateKbps,
                                 kScreenshareDefaultTl1BitrateKbps);
   if (!group.empty() && !FromFieldTrialGroup(group, &config)) {
-    LOG(LS_WARNING) << "Unable to parse WebRTC-ScreenshareLayerRates"
-                       " field trial group: '" << group << "'.";
+    RTC_LOG(LS_WARNING) << "Unable to parse WebRTC-ScreenshareLayerRates"
+                           " field trial group: '"
+                        << group << "'.";
   }
   return config;
 }