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/api/rtcerror.h b/api/rtcerror.h
index b412b29..962f46d 100644
--- a/api/rtcerror.h
+++ b/api/rtcerror.h
@@ -151,8 +151,8 @@
 #define LOG_AND_RETURN_ERROR_EX(type, message, severity) \
   {                                                      \
     RTC_DCHECK(type != RTCErrorType::NONE);              \
-    LOG(severity) << message << " (" << type << ")";     \
-    return webrtc::RTCError(type, message);   \
+    RTC_LOG(severity) << message << " (" << type << ")"; \
+    return webrtc::RTCError(type, message);              \
   }
 
 #define LOG_AND_RETURN_ERROR(type, message) \
@@ -176,7 +176,7 @@
 //    std::unique_ptr<Foo> foo = result.ConsumeValue();
 //    foo->DoSomethingCool();
 //  } else {
-//    LOG(LS_ERROR) << result.error();
+//    RTC_LOG(LS_ERROR) << result.error();
 //  }
 //
 // Example factory implementation returning RTCErrorOr<std::unique_ptr<T>>: