Remove unused thread pool from standalone VM binary.

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 12ec0dbab5b182960c05765357798f87afb17b06..2cc6b8bf21da5a04619f9850a1cfd78ad89430c5 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -540,9 +540,6 @@ int main(int argc, char** argv) {
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
-  // Initialize event handler.
-  EventHandler::Initialize();
-
   // Initialize the Dart VM.
   Dart_Initialize(CreateIsolateAndSetup, NULL);
 
@@ -617,8 +614,6 @@ int main(int argc, char** argv) {
   DumpPprofSymbolInfo();
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
-  // Terminate event handler.
-  EventHandler::Terminate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();