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/codec_database.cc b/modules/video_coding/codec_database.cc
index 18e6cc1..2bc3077 100644
--- a/modules/video_coding/codec_database.cc
+++ b/modules/video_coding/codec_database.cc
@@ -45,7 +45,7 @@
     default:
       break;
   }
-  LOG(LS_WARNING) << "No internal decoder of this type exists.";
+  RTC_LOG(LS_WARNING) << "No internal decoder of this type exists.";
   return std::unique_ptr<VCMGenericDecoder>();
 }
 
@@ -149,7 +149,7 @@
   encoded_frame_callback_->SetInternalSource(internal_source_);
   if (ptr_encoder_->InitEncode(&send_codec_, number_of_cores_,
                                max_payload_size_) < 0) {
-    LOG(LS_ERROR) << "Failed to initialize video encoder.";
+    RTC_LOG(LS_ERROR) << "Failed to initialize video encoder.";
     DeleteEncoder();
     return false;
   }
@@ -395,13 +395,13 @@
     const VCMEncodedFrame& frame,
     VideoCodec* new_codec) const {
   uint8_t payload_type = frame.PayloadType();
-  LOG(LS_INFO) << "Initializing decoder with payload type '"
-               << static_cast<int>(payload_type) << "'.";
+  RTC_LOG(LS_INFO) << "Initializing decoder with payload type '"
+                   << static_cast<int>(payload_type) << "'.";
   RTC_DCHECK(new_codec);
   const VCMDecoderMapItem* decoder_item = FindDecoderItem(payload_type);
   if (!decoder_item) {
-    LOG(LS_ERROR) << "Can't find a decoder associated with payload type: "
-                  << static_cast<int>(payload_type);
+    RTC_LOG(LS_ERROR) << "Can't find a decoder associated with payload type: "
+                      << static_cast<int>(payload_type);
     return nullptr;
   }
   std::unique_ptr<VCMGenericDecoder> ptr_decoder;