Remove unused external typed data factories.

runtime/vm/os_android.cc

Index: runtime/vm/os_android.cc
diff --git a/runtime/vm/os_android.cc b/runtime/vm/os_android.cc
index c7cc8c5f7d1db777ba86cfb9cfcb98eaf1409d46..92fcfd9c97a021126052ab468ae76ed8cc333a5a 100644
--- a/runtime/vm/os_android.cc
+++ b/runtime/vm/os_android.cc
@@ -181,23 +181,6 @@ 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 = memalign(alignment, size);
-  if (p == NULL) {
-    UNREACHABLE();
-  }
-  return p;
-}
-
-
-void OS::AlignedFree(void* ptr) {
-  free(ptr);
-}
-
-
 // TODO(5411554):  May need to hoist these architecture dependent code
 // into a architecture specific file e.g: os_ia32_linux.cc
 intptr_t OS::ActivationFrameAlignment() {