Fix Windows SDK build.

runtime/vm/os_thread_win.cc

Index: runtime/vm/os_thread_win.cc
diff --git a/runtime/vm/os_thread_win.cc b/runtime/vm/os_thread_win.cc
index aac5639a064647f4e24f4149572b2a8ab4af053e..52fbd983fe6bdd8c7a1463f1929f14d77d8927e2 100644
--- a/runtime/vm/os_thread_win.cc
+++ b/runtime/vm/os_thread_win.cc
@@ -276,8 +276,7 @@ void Mutex::Unlock() {
 }
 
 
-ThreadLocalKey MonitorWaitData::monitor_wait_data_key_ =
-    OSThread::kUnsetThreadLocalKey;
+ThreadLocalKey MonitorWaitData::monitor_wait_data_key_ = kUnsetThreadLocalKey;
 
 
 Monitor::Monitor() {
@@ -327,8 +326,7 @@ void Monitor::Exit() {
 
 
 void MonitorWaitData::ThreadExit() {
-  if (MonitorWaitData::monitor_wait_data_key_ !=
-      OSThread::kUnsetThreadLocalKey) {
+  if (MonitorWaitData::monitor_wait_data_key_ != kUnsetThreadLocalKey) {
     uword raw_wait_data =
       OSThread::GetThreadLocal(MonitorWaitData::monitor_wait_data_key_);
     // Clear in case this is called a second time.
@@ -436,8 +434,7 @@ void MonitorData::SignalAndRemoveAllWaiters() {
 MonitorWaitData* MonitorData::GetMonitorWaitDataForThread() {
   // Ensure that the thread local key for monitor wait data objects is
   // initialized.
-  ASSERT(MonitorWaitData::monitor_wait_data_key_ !=
-         OSThread::kUnsetThreadLocalKey);
+  ASSERT(MonitorWaitData::monitor_wait_data_key_ != kUnsetThreadLocalKey);
 
   // Get the MonitorWaitData object containing the event for this
   // thread from thread local storage. Create it if it does not exist.