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/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH264.mm b/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH264.mm
index 4cf48bd..261b945 100644
--- a/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH264.mm
+++ b/sdk/objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH264.mm
@@ -48,7 +48,7 @@
   std::unique_ptr<RTCFrameDecodeParams> decodeParams(
       reinterpret_cast<RTCFrameDecodeParams *>(params));
   if (status != noErr) {
-    LOG(LS_ERROR) << "Failed to decode frame. Status: " << status;
+    RTC_LOG(LS_ERROR) << "Failed to decode frame. Status: " << status;
     return;
   }
   // TODO(tkchin): Handle CVO properly.
@@ -126,7 +126,7 @@
     // This can happen after backgrounding. We need to wait for the next
     // sps/pps before we can resume so we request a keyframe by returning an
     // error.
-    LOG(LS_WARNING) << "Missing video format. Frame with sps/pps required.";
+    RTC_LOG(LS_WARNING) << "Missing video format. Frame with sps/pps required.";
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   CMSampleBufferRef sampleBuffer = nullptr;
@@ -153,7 +153,7 @@
 #endif
   CFRelease(sampleBuffer);
   if (status != noErr) {
-    LOG(LS_ERROR) << "Failed to decode frame with code: " << status;
+    RTC_LOG(LS_ERROR) << "Failed to decode frame with code: " << status;
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   return WEBRTC_VIDEO_CODEC_OK;