Remove some dead code.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9737e7fe1624eafb8bb6010d04bb4605ca0546a3..a3f1130e93e1eda28c3af24bc6cd8771a2632e2e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7954,17 +7954,6 @@ class StringInputBuffer: public unibrow::InputBuffer<String, String*, 1024> {
 };
 
 
-class SafeStringInputBuffer
-  : public unibrow::InputBuffer<String, String**, 256> {
- public:
-  virtual void Seek(unsigned pos);
-  inline SafeStringInputBuffer()
-      : unibrow::InputBuffer<String, String**, 256>() {}
-  explicit inline SafeStringInputBuffer(String** backing)
-      : unibrow::InputBuffer<String, String**, 256>(backing) {}
-};
-
-
 template <typename T>
 class VectorIterator {
  public: