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/socket_unittest.cc b/rtc_base/socket_unittest.cc
index 9e44572..a31cc02 100644
--- a/rtc_base/socket_unittest.cc
+++ b/rtc_base/socket_unittest.cc
@@ -32,10 +32,10 @@
 using webrtc::testing::SSE_WRITE;
 using webrtc::testing::StreamSink;
 
-#define MAYBE_SKIP_IPV6                             \
-  if (!HasIPv6Enabled()) {                          \
-    LOG(LS_INFO) << "No IPv6... skipping";          \
-    return;                                         \
+#define MAYBE_SKIP_IPV6                        \
+  if (!HasIPv6Enabled()) {                     \
+    RTC_LOG(LS_INFO) << "No IPv6... skipping"; \
+    return;                                    \
   }
 
 // Data size to be used in TcpInternal tests.
@@ -60,7 +60,7 @@
 
 void SocketTest::TestConnectWithDnsLookupIPv6() {
   // TODO: Enable this when DNS resolution supports IPv6.
-  LOG(LS_INFO) << "Skipping IPv6 DNS test";
+  RTC_LOG(LS_INFO) << "Skipping IPv6 DNS test";
   // ConnectWithDnsLookupInternal(kIPv6Loopback, "localhost6");
 }
 
@@ -377,8 +377,8 @@
   WAIT_(client->GetState() == AsyncSocket::CS_CLOSED, kTimeout,
         dns_lookup_finished);
   if (!dns_lookup_finished) {
-    LOG(LS_WARNING) << "Skipping test; DNS resolution took longer than 5 "
-                    << "seconds.";
+    RTC_LOG(LS_WARNING) << "Skipping test; DNS resolution took longer than 5 "
+                        << "seconds.";
     return;
   }
 
@@ -970,8 +970,8 @@
     if (ret != test_packet_size) {
       error = client->GetError();
       if (error == expected_error) {
-        LOG(LS_INFO) << "Got expected error code after sending "
-                     << sent_packet_num << " packets.";
+        RTC_LOG(LS_INFO) << "Got expected error code after sending "
+                         << sent_packet_num << " packets.";
         break;
       }
     }
@@ -979,7 +979,7 @@
   EXPECT_EQ(expected_error, error);
   EXPECT_FALSE(client->ready_to_send());
   EXPECT_TRUE_WAIT(client->ready_to_send(), kTimeout);
-  LOG(LS_INFO) << "Got SignalReadyToSend";
+  RTC_LOG(LS_INFO) << "Got SignalReadyToSend";
 }
 
 void SocketTest::GetSetOptionsInternal(const IPAddress& loopback) {