Revert "Added ability to lock strings to prevent their representation or encoding from changing."

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index d3fd12635b152fd8631e166cef19d582677a5028..407a3b59afea54fd842d5840901baa72ffae1301 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -944,20 +944,4 @@ bool CompileOptimized(Handle<JSFunction> function,
   return CompileLazyHelper(&info, flag);
 }
 
-
-void LockString(Handle<String> string) {
-  CALL_HEAP_FUNCTION_VOID(string->GetHeap()->isolate(),
-                          string->GetHeap()->LockString(*string));
-}
-
-
-StringLock::StringLock(Handle<String> string) : string_(string) {
-  LockString(string);
-}
-
-
-StringLock::~StringLock() {
-  string_->GetHeap()->UnlockString(*string_);
-}
-
 } }  // namespace v8::internal