[debugger api] remove legacy JSON debug protocol.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 0095cf43a7d5ddad1a38e4d37a899b7cae537fc9..ab4148c05d04337436dde4585bb3bf6e37dc3f99 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1249,28 +1249,6 @@ void Logger::HeapSampleItemEvent(const char* type, int number, int bytes) {
 }
 
 
-void Logger::DebugTag(const char* call_site_tag) {
-  if (!log_->IsEnabled() || !FLAG_log) return;
-  Log::MessageBuilder msg(log_);
-  msg.Append("debug-tag,%s", call_site_tag);
-  msg.WriteToLogFile();
-}
-
-
-void Logger::DebugEvent(const char* event_type, Vector<uint16_t> parameter) {
-  if (!log_->IsEnabled() || !FLAG_log) return;
-  StringBuilder s(parameter.length() + 1);
-  for (int i = 0; i < parameter.length(); ++i) {
-    s.AddCharacter(static_cast<char>(parameter[i]));
-  }
-  char* parameter_string = s.Finalize();
-  Log::MessageBuilder msg(log_);
-  msg.Append("debug-queue-event,%s,%15.3f,%s", event_type,
-             base::OS::TimeCurrentMillis(), parameter_string);
-  DeleteArray(parameter_string);
-  msg.WriteToLogFile();
-}
-
 void Logger::RuntimeCallTimerEvent() {
   RuntimeCallStats* stats = isolate_->counters()->runtime_call_stats();
   RuntimeCallTimer* timer = stats->current_timer();