diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index ab03e3d..8673f04 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -1468,24 +1468,6 @@
 
 // Definition of invalid thread handle and id.
 static const HANDLE kNoThread = INVALID_HANDLE_VALUE;
-static const DWORD kNoThreadId = 0;
-
-
-class ThreadHandle::PlatformData : public Malloced {
- public:
-  explicit PlatformData(ThreadHandle::Kind kind) {
-    Initialize(kind);
-  }
-
-  void Initialize(ThreadHandle::Kind kind) {
-    switch (kind) {
-      case ThreadHandle::SELF: tid_ = GetCurrentThreadId(); break;
-      case ThreadHandle::INVALID: tid_ = kNoThreadId; break;
-    }
-  }
-  DWORD tid_;  // Win32 thread identifier.
-};
-
 
 // Entry point for threads. The supplied argument is a pointer to the thread
 // object. The entry function dispatches to the run method in the thread
@@ -1496,41 +1478,12 @@
   // This is also initialized by the last parameter to _beginthreadex() but we
   // don't know which thread will run first (the original thread or the new
   // one) so we initialize it here too.
-  thread->thread_handle_data()->tid_ = GetCurrentThreadId();
   Thread::SetThreadLocal(Isolate::isolate_key(), thread->isolate());
   thread->Run();
   return 0;
 }
 
 
-// Initialize thread handle to invalid handle.
-ThreadHandle::ThreadHandle(ThreadHandle::Kind kind) {
-  data_ = new PlatformData(kind);
-}
-
-
-ThreadHandle::~ThreadHandle() {
-  delete data_;
-}
-
-
-// The thread is running if it has the same id as the current thread.
-bool ThreadHandle::IsSelf() const {
-  return GetCurrentThreadId() == data_->tid_;
-}
-
-
-// Test for invalid thread handle.
-bool ThreadHandle::IsValid() const {
-  return data_->tid_ != kNoThreadId;
-}
-
-
-void ThreadHandle::Initialize(ThreadHandle::Kind kind) {
-  data_->Initialize(kind);
-}
-
-
 class Thread::PlatformData : public Malloced {
  public:
   explicit PlatformData(HANDLE thread) : thread_(thread) {}
@@ -1542,8 +1495,7 @@
 // handle until it is started.
 
 Thread::Thread(Isolate* isolate, const Options& options)
-    : ThreadHandle(ThreadHandle::INVALID),
-      isolate_(isolate),
+    : isolate_(isolate),
       stack_size_(options.stack_size) {
   data_ = new PlatformData(kNoThread);
   set_name(options.name);
@@ -1551,8 +1503,7 @@
 
 
 Thread::Thread(Isolate* isolate, const char* name)
-    : ThreadHandle(ThreadHandle::INVALID),
-      isolate_(isolate),
+    : isolate_(isolate),
       stack_size_(0) {
   data_ = new PlatformData(kNoThread);
   set_name(name);
@@ -1582,9 +1533,7 @@
                      ThreadEntry,
                      this,
                      0,
-                     reinterpret_cast<unsigned int*>(
-                         &thread_handle_data()->tid_)));
-  ASSERT(IsValid());
+                     NULL));
 }