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/virtualsocket_unittest.cc b/rtc_base/virtualsocket_unittest.cc
index 6081346..a6a4ee1 100644
--- a/rtc_base/virtualsocket_unittest.cc
+++ b/rtc_base/virtualsocket_unittest.cc
@@ -707,7 +707,7 @@
   // address.
   void DelayTest(const SocketAddress& initial_addr) {
     time_t seed = ::time(nullptr);
-    LOG(LS_VERBOSE) << "seed = " << seed;
+    RTC_LOG(LS_VERBOSE) << "seed = " << seed;
     srand(static_cast<unsigned int>(seed));
 
     const uint32_t mean = 2000;
@@ -744,7 +744,8 @@
         receiver.samples * receiver.sum_sq - receiver.sum * receiver.sum;
     double den = receiver.samples * (receiver.samples - 1);
     const double sample_stddev = sqrt(num / den);
-    LOG(LS_VERBOSE) << "mean=" << sample_mean << " stddev=" << sample_stddev;
+    RTC_LOG(LS_VERBOSE) << "mean=" << sample_mean
+                        << " stddev=" << sample_stddev;
 
     EXPECT_LE(500u, receiver.samples);
     // We initially used a 0.1 fudge factor, but on the build machine, we