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/p2p/base/stunrequest.cc b/p2p/base/stunrequest.cc
index cec9ce3..15ee24b 100644
--- a/p2p/base/stunrequest.cc
+++ b/p2p/base/stunrequest.cc
@@ -125,9 +125,9 @@
   } else if (msg->type() == GetStunErrorResponseType(request->type())) {
     request->OnErrorResponse(msg);
   } else {
-    LOG(LERROR) << "Received response with wrong type: " << msg->type()
-                << " (expecting "
-                << GetStunSuccessResponseType(request->type()) << ")";
+    RTC_LOG(LERROR) << "Received response with wrong type: " << msg->type()
+                    << " (expecting "
+                    << GetStunSuccessResponseType(request->type()) << ")";
     return false;
   }
 
@@ -157,7 +157,8 @@
   rtc::ByteBufferReader buf(data, size);
   std::unique_ptr<StunMessage> response(iter->second->msg_->CreateNew());
   if (!response->Read(&buf)) {
-    LOG(LS_WARNING) << "Failed to read STUN response " << rtc::hex_encode(id);
+    RTC_LOG(LS_WARNING) << "Failed to read STUN response "
+                        << rtc::hex_encode(id);
     return false;
   }
 
@@ -248,8 +249,8 @@
   if (retransmissions >= STUN_MAX_RETRANSMISSIONS) {
     timeout_ = true;
   }
-  LOG(LS_VERBOSE) << "Sent STUN request " << count_
-                  << "; resend delay = " << resend_delay();
+  RTC_LOG(LS_VERBOSE) << "Sent STUN request " << count_
+                      << "; resend delay = " << resend_delay();
 }
 
 int StunRequest::resend_delay() {