Fix file descriptor leak in event handler implementation. When shutting down an isolate, we did not…

runtime/platform/thread_win.cc

Index: runtime/platform/thread_win.cc
diff --git a/runtime/platform/thread_win.cc b/runtime/platform/thread_win.cc
index 18ec6d0bdb2a3feecfd4d8af19ab66049285bedf..662b376664f3a0503b61704a60776470daaf687e 100644
--- a/runtime/platform/thread_win.cc
+++ b/runtime/platform/thread_win.cc
@@ -42,8 +42,8 @@ static unsigned int __stdcall ThreadEntry(void* data_ptr) {
   // Call the supplied thread start function handing it its parameters.
   function(parameter);
 
-  // When the function returns here close the handle.
-  CloseHandle(GetCurrentThread());
+  // Clean up the monitor wait data for this thread.
+  MonitorWaitData::ThreadExit();
 
   return 0;
 }
@@ -173,6 +173,17 @@ void Monitor::Exit() {
 }
 
 
+void MonitorWaitData::ThreadExit() {
+  uword raw_wait_data =
+    Thread::GetThreadLocal(MonitorWaitData::monitor_wait_data_key_);
+  if (raw_wait_data != 0) {
+    MonitorWaitData* wait_data =
+        reinterpret_cast<MonitorWaitData*>(raw_wait_data);
+    delete wait_data;
+  }
+}
+
+
 void MonitorData::AddWaiter(MonitorWaitData* wait_data) {
   // Add the MonitorWaitData object to the list of objects waiting for
   // this monitor.