Change the allocation of the stdout and stderr collected by Process.runSync

runtime/bin/io_buffer.cc

Index: runtime/bin/io_buffer.cc
diff --git a/runtime/bin/io_buffer.cc b/runtime/bin/io_buffer.cc
index b82f4eac6020239ba386735551f7421222354b43..ef08b4f20457d4dde8996e9c76ff64b33557fd55 100644
--- a/runtime/bin/io_buffer.cc
+++ b/runtime/bin/io_buffer.cc
@@ -25,18 +25,6 @@ Dart_Handle IOBuffer::Allocate(intptr_t size, uint8_t **buffer) {
 }
 
 
-Dart_Handle IOBuffer::Create(uint8_t *buffer, intptr_t size) {
-  Dart_Handle result = Dart_NewExternalTypedData(Dart_TypedData_kUint8,
-                                                 buffer,
-                                                 size);
-  Dart_NewWeakPersistentHandle(result, buffer, IOBuffer::Finalizer);
-  if (Dart_IsError(result)) {
-    Dart_PropagateError(result);
-  }
-  return result;
-}
-
-
 uint8_t* IOBuffer::Allocate(intptr_t size) {
   return new uint8_t[size];
 }