De-virtualize snapshot sink.

src/snapshot-source-sink.cc

Index: src/snapshot-source-sink.cc
diff --git a/src/snapshot-source-sink.cc b/src/snapshot-source-sink.cc
index 29bad33aac0b4c813aa9899a3fdf7bb25f865fc0..8e3b8a9d4436a88680fde5f8ee7ef4a964ead227 100644
--- a/src/snapshot-source-sink.cc
+++ b/src/snapshot-source-sink.cc
@@ -89,11 +89,5 @@ bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) {
   }
 }
 
-
-void DebugSnapshotSink::Put(byte b, const char* description) {
-  PrintF("%24s: %x\n", description, b);
-  sink_->Put(b, description);
-}
-
 }  // namespace v8::internal
 }  // namespace v8