[debugger] remove some dead code.

src/debug/debug.js

 // 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.
 
 (function (global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 876 matching lines @@
     opt_additional_context) {
   return MakeMirror(%DebugEvaluateGlobal(this.break_id, source,
                                          TO_BOOLEAN(disable_break),
                                          opt_additional_context));
 };
 
 ExecutionState.prototype.frameCount = function() {
   return %GetFrameCount(this.break_id);
 };
 
-ExecutionState.prototype.threadCount = function() {
-  return %GetThreadCount(this.break_id);
-};
-
 ExecutionState.prototype.frame = function(opt_index) {
   // If no index supplied return the selected frame.
   if (opt_index == null) opt_index = this.selected_frame;
   if (opt_index < 0 || opt_index >= this.frameCount()) {
     throw MakeTypeError(kDebuggerFrame);
   }
   return new FrameMirror(this.break_id, opt_index);
 };
 
 ExecutionState.prototype.setSelectedFrame = function(index) {
@@ skipping 1255 matching lines @@
       }
       if (!found) continue;
     }
     if (types & ScriptTypeFlag(scripts[i].type)) {
       response.body.push(MakeMirror(scripts[i]));
     }
   }
 };
 
 
-DebugCommandProcessor.prototype.threadsRequest_ = function(request, response) {
-  // Get the number of threads.
-  var total_threads = this.exec_state_.threadCount();
-
-  // Get information for all threads.
-  var threads = [];
-  for (var i = 0; i < total_threads; i++) {
-    var details = %GetThreadDetails(this.exec_state_.break_id, i);
-    var thread_info = { current: details[0],
-                        id: details[1]
-                      };
-    threads.push(thread_info);
-  }
-
-  // Create the response body.
-  response.body = {
-    totalThreads: total_threads,
-    threads: threads
-  };
-};
-
-
 DebugCommandProcessor.prototype.suspendRequest_ = function(request, response) {
   response.running = false;
 };
 
 
 DebugCommandProcessor.prototype.versionRequest_ = function(request, response) {
   response.body = {
     V8Version: %GetV8Version()
   };
 };
@@ skipping 145 matching lines @@
     "backtrace":            proto.backtraceRequest_,
     "frame":                proto.frameRequest_,
     "scopes":               proto.scopesRequest_,
     "scope":                proto.scopeRequest_,
     "setvariablevalue":     proto.setVariableValueRequest_,
     "evaluate":             proto.evaluateRequest_,
     "lookup":               proto.lookupRequest_,
     "references":           proto.referencesRequest_,
     "source":               proto.sourceRequest_,
     "scripts":              proto.scriptsRequest_,
-    "threads":              proto.threadsRequest_,
     "suspend":              proto.suspendRequest_,
     "version":              proto.versionRequest_,
     "changelive":           proto.changeLiveRequest_,
     "restartframe":         proto.restartFrameRequest_,
     "flags":                proto.debuggerFlagsRequest_,
     "v8flag":               proto.v8FlagsRequest_,
     "gc":                   proto.gcRequest_,
   };
 })();
 
@@ skipping 113 matching lines @@
   "IsBreakPointTriggered", IsBreakPointTriggered,
   "UpdateScriptBreakPoints", UpdateScriptBreakPoints,
 ]);
 
 // Export to liveedit.js
 utils.Export(function(to) {
   to.GetScriptBreakPoints = GetScriptBreakPoints;
 });
 
 })