[debugger] Removed unused GetStepInPositions method

src/debug/mirrors.js

Index: src/debug/mirrors.js
diff --git a/src/debug/mirrors.js b/src/debug/mirrors.js
index 787cc64649cb7ace1ba1b20bbe8ee5c9abe29362..be76f5873d029fd84199aa5ad4d898cc767a79d5 100644
--- a/src/debug/mirrors.js
+++ b/src/debug/mirrors.js
@@ -1801,11 +1801,6 @@ FrameDetails.prototype.scopeCount = function() {
 };
 
 
-FrameDetails.prototype.stepInPositionsImpl = function() {
-  return %GetStepInPositions(this.break_id_, this.frameId());
-};
-
-
 /**
  * Mirror object for stack frames.
  * @param {number} break_id The break id in the VM for which this frame is
@@ -1985,29 +1980,6 @@ FrameMirror.prototype.allScopes = function(opt_ignore_nested_scopes) {
 };
 
 
-FrameMirror.prototype.stepInPositions = function() {
-  var script = this.func().script();
-  var funcOffset = this.func().sourcePosition_();
-
-  var stepInRaw = this.details_.stepInPositionsImpl();
-  var result = [];
-  if (stepInRaw) {
-    for (var i = 0; i < stepInRaw.length; i++) {
-      var posStruct = {};
-      var offset = script.locationFromPosition(funcOffset + stepInRaw[i],
-                                               true);
-      serializeLocationFields(offset, posStruct);
-      var item = {
-        position: posStruct
-      };
-      result.push(item);
-    }
-  }
-
-  return result;
-};
-
-
 FrameMirror.prototype.evaluate = function(source, disable_break,
                                           opt_context_object) {
   return MakeMirror(%DebugEvaluate(this.break_id_,