Remove unused external typed data factories.

runtime/vm/os_linux.cc

Index: runtime/vm/os_linux.cc
diff --git a/runtime/vm/os_linux.cc b/runtime/vm/os_linux.cc
index 58efa89840a84e7f7f63c5eed0a18aceaf8aa910..12dd6461b5977058b12ec1b30ed71d765d34899c 100644
--- a/runtime/vm/os_linux.cc
+++ b/runtime/vm/os_linux.cc
@@ -188,23 +188,6 @@ 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() {