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/modules/video_coding/session_info.cc b/modules/video_coding/session_info.cc
index c0a294d..74d7bfa 100644
--- a/modules/video_coding/session_info.cc
+++ b/modules/video_coding/session_info.cc
@@ -437,7 +437,7 @@
   }
 
   if (packets_.size() == kMaxPacketsInSession) {
-    LOG(LS_ERROR) << "Max number of packets per frame has been reached.";
+    RTC_LOG(LS_ERROR) << "Max number of packets per frame has been reached.";
     return -1;
   }
 
@@ -478,8 +478,9 @@
       first_packet_seq_num_ = static_cast<int>(packet.seqNum);
     } else if (first_packet_seq_num_ != -1 &&
                IsNewerSequenceNumber(first_packet_seq_num_, packet.seqNum)) {
-      LOG(LS_WARNING) << "Received packet with a sequence number which is out "
-                         "of frame boundaries";
+      RTC_LOG(LS_WARNING)
+          << "Received packet with a sequence number which is out "
+             "of frame boundaries";
       return -3;
     } else if (frame_type_ == kEmptyFrame && packet.frameType != kEmptyFrame) {
       // Update the frame type with the type of the first media packet.
@@ -492,8 +493,9 @@
       last_packet_seq_num_ = static_cast<int>(packet.seqNum);
     } else if (last_packet_seq_num_ != -1 &&
                IsNewerSequenceNumber(packet.seqNum, last_packet_seq_num_)) {
-      LOG(LS_WARNING) << "Received packet with a sequence number which is out "
-                         "of frame boundaries";
+      RTC_LOG(LS_WARNING)
+          << "Received packet with a sequence number which is out "
+             "of frame boundaries";
       return -3;
     }
   }