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/rtc_base/sslidentity_unittest.cc b/rtc_base/sslidentity_unittest.cc
index 6932298..c26d8d7 100644
--- a/rtc_base/sslidentity_unittest.cc
+++ b/rtc_base/sslidentity_unittest.cc
@@ -563,7 +563,7 @@
       memcpy(buf, entry.string, length);    // Copy the ASN1 string...
       buf[length] = rtc::CreateRandomId();  // ...and terminate it with junk.
       int64_t res = rtc::ASN1TimeToSec(buf, length, entry.long_format);
-      LOG(LS_VERBOSE) << entry.string;
+      RTC_LOG(LS_VERBOSE) << entry.string;
       ASSERT_EQ(entry.want, res);
     }
     // Run all examples again, but with an invalid length.
@@ -572,7 +572,7 @@
       memcpy(buf, entry.string, length);    // Copy the ASN1 string...
       buf[length] = rtc::CreateRandomId();  // ...and terminate it with junk.
       int64_t res = rtc::ASN1TimeToSec(buf, length - 1, entry.long_format);
-      LOG(LS_VERBOSE) << entry.string;
+      RTC_LOG(LS_VERBOSE) << entry.string;
       ASSERT_EQ(-1, res);
     }
   }