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/helpers.cc b/sdk/objc/Framework/Classes/VideoToolbox/helpers.cc
index 1e4a53f..ac957f1 100644
--- a/sdk/objc/Framework/Classes/VideoToolbox/helpers.cc
+++ b/sdk/objc/Framework/Classes/VideoToolbox/helpers.cc
@@ -44,8 +44,8 @@
   CFRelease(cfNum);
   if (status != noErr) {
     std::string key_string = CFStringToString(key);
-    LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
-                  << " to " << value << ": " << status;
+    RTC_LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
+                      << " to " << value << ": " << status;
   }
 }
 
@@ -60,8 +60,8 @@
   CFRelease(cfNum);
   if (status != noErr) {
     std::string key_string = CFStringToString(key);
-    LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
-                  << " to " << value << ": " << status;
+    RTC_LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
+                      << " to " << value << ": " << status;
   }
 }
 
@@ -71,8 +71,8 @@
   OSStatus status = VTSessionSetProperty(session, key, cf_bool);
   if (status != noErr) {
     std::string key_string = CFStringToString(key);
-    LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
-                  << " to " << value << ": " << status;
+    RTC_LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
+                      << " to " << value << ": " << status;
   }
 }
 
@@ -84,7 +84,7 @@
   if (status != noErr) {
     std::string key_string = CFStringToString(key);
     std::string val_string = CFStringToString(value);
-    LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
-                  << " to " << val_string << ": " << status;
+    RTC_LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
+                      << " to " << val_string << ": " << status;
   }
 }