Make std* blocking file-descriptors.

runtime/bin/platform_win.cc

Index: runtime/bin/platform_win.cc
diff --git a/runtime/bin/platform_win.cc b/runtime/bin/platform_win.cc
index 2d7a5a156b9891c2cfab2c5918bd9a44e321ad51..85b6694d47dba42a51d60eb42c083047b95ec09f 100644
--- a/runtime/bin/platform_win.cc
+++ b/runtime/bin/platform_win.cc
@@ -64,20 +64,6 @@ void Platform::FreeEnvironment(char** env, int count) {
   delete[] env;
 }
 
-
-void Platform::PrintBlocking(FILE* file, const char* format, ...) {
-  // No need to set blocking, as it's always blocking on Windows.
-  va_list args;
-  va_start(args, format);
-  vfprintf(file, format, args);
-  fflush(file);
-  va_end(args);
-}
-
-
-void Platform::Cleanup() {
-}
-
 }  // namespace bin
 }  // namespace dart