Remove unused external typed data factories.

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 809b0ad361b65b13e7d705fe4aa074901db6f2e5..129dcd12eaef6690b9da8b18bb22efd1d2ef085c 100644
--- a/runtime/vm/os_win.cc
+++ b/runtime/vm/os_win.cc
@@ -190,23 +190,6 @@ int64_t OS::GetCurrentThreadCPUMicros() {
 }
 
 
-void* OS::AlignedAllocate(intptr_t size, intptr_t alignment) {
-  const int kMinimumAlignment = 16;
-  ASSERT(Utils::IsPowerOfTwo(alignment));
-  ASSERT(alignment >= kMinimumAlignment);
-  void* p = _aligned_malloc(size, alignment);
-  if (p == NULL) {
-    UNREACHABLE();
-  }
-  return p;
-}
-
-
-void OS::AlignedFree(void* ptr) {
-  _aligned_free(ptr);
-}
-
-
 intptr_t OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   // Windows 64-bit ABI requires the stack to be 16-byte aligned.