Remove usage of Locker/Unlocker where possible.

src/d8-readline.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdio.h>  // NOLINT
 #include <string.h> // NOLINT
 #include <readline/readline.h> // NOLINT
 #include <readline/history.h> // NOLINT
 
 // The readline includes leaves RETURN defined which breaks V8 compilation.
@@ skipping 64 matching lines @@
 }
 
 
 bool ReadLineEditor::Close() {
   return write_history(kHistoryFileName) == 0;
 }
 
 
 Handle<String> ReadLineEditor::Prompt(const char* prompt) {
   char* result = NULL;
-  {  // Release lock for blocking input.
-    Unlocker unlock(isolate_);
-    result = readline(prompt);
-  }
+  result = readline(prompt);
   if (result == NULL) return Handle<String>();
   AddHistory(result);
   return String::NewFromUtf8(isolate_, result);
 }
 
 
 void ReadLineEditor::AddHistory(const char* str) {
   // Do not record empty input.
   if (strlen(str) == 0) return;
   // Remove duplicate history entry.
@@ skipping 17 matching lines @@
   char** result = completion_matches(text, CompletionGenerator);
   rl_attempted_completion_over = true;
   return result;
 }
 
 
 char* ReadLineEditor::CompletionGenerator(const char* text, int state) {
   static unsigned current_index;
   static Persistent<Array> current_completions;
   Isolate* isolate = read_line_editor.isolate_;
-  Locker lock(isolate);
   HandleScope scope(isolate);
   Handle<Array> completions;
   if (state == 0) {
     Local<String> full_text = String::NewFromUtf8(isolate,
                                                   rl_line_buffer,
                                                   String::kNormalString,
                                                   rl_point);
     completions = Shell::GetCompletions(isolate,
                                         String::NewFromUtf8(isolate, text),
                                         full_text);
@@ skipping 10 matching lines @@
     return strdup(*str);
   } else {
     current_completions.Reset();
     return NULL;
   }
 }
 #endif  // V8_SHARED
 
 
 }  // namespace v8