[dart:io] Build fixes for Namespaces

runtime/bin/file_android.cc

Index: runtime/bin/file_android.cc
diff --git a/runtime/bin/file_android.cc b/runtime/bin/file_android.cc
index 36a27cfed58e9b19df29bd8b4adeb76df8d6ddc1..06fdea43dcec049c4676b67349885a6eb9b147c3 100644
--- a/runtime/bin/file_android.cc
+++ b/runtime/bin/file_android.cc
@@ -497,7 +497,7 @@ bool File::SetLastAccessed(Namespace* namespc,
                            const char* name,
                            int64_t millis) {
   // First get the current times.
-  struct stat64 st;
+  struct stat st;
   if (!StatHelper(namespc, name, &st)) {
     return false;
   }
@@ -514,7 +514,7 @@ bool File::SetLastModified(Namespace* namespc,
                            const char* name,
                            int64_t millis) {
   // First get the current times.
-  struct stat64 st;
+  struct stat st;
   if (!StatHelper(namespc, name, &st)) {
     return false;
   }