Revert "Update Dart VM to 1.16.0"

This reverts commit b1ff7531b5be7fda0b8b0fa21be967243168ee60.

Change-Id: If8cc9d8735b8de531b57bb16ac7d6d3adbbc73fd
diff --git a/google_dart_vm-af705ac989a359ef369df66de455ef934bb40634.tar.gz b/google_dart_vm-af705ac989a359ef369df66de455ef934bb40634.tar.gz
new file mode 100644
index 0000000..abf5f2b
--- /dev/null
+++ b/google_dart_vm-af705ac989a359ef369df66de455ef934bb40634.tar.gz
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diff --git a/google_dart_vm-f4f26131e9548e8059354313ed88a7a097946f6d.tar.gz b/google_dart_vm-f4f26131e9548e8059354313ed88a7a097946f6d.tar.gz
deleted file mode 100644
index b8bcab7..0000000
--- a/google_dart_vm-f4f26131e9548e8059354313ed88a7a097946f6d.tar.gz
+++ /dev/null
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