Remove deleted files from build files

runtime/vm/os_win.cc

Index: runtime/vm/os_win.cc
diff --git a/runtime/vm/os_win.cc b/runtime/vm/os_win.cc
index 1203c1e15da735a715667f060215d675e65b8fe9..6d378a12e69e3efa9b10f43b186107f0f05b9195 100644
--- a/runtime/vm/os_win.cc
+++ b/runtime/vm/os_win.cc
@@ -233,6 +233,13 @@ bool OS::StringToInt64(const char* str, int64_t* value) {
 }
 
 
+void OS::RegisterCodeObservers() {
+#if defined(DART_VTUNE_SUPPORT)
+  Register(new VTuneCodeObserver);
+#endif
+}
+
+
 void OS::PrintErr(const char* format, ...) {
   va_list args;
   va_start(args, format);
@@ -263,6 +270,7 @@ void OS::Abort() {
 
 
 void OS::Exit(int code) {
+  CodeObservers::DeleteAll();
   exit(code);
 }