Revert "Expose the content of Maps and WeakMaps through MapMirror."

src/mirror-debugger.js

Index: src/mirror-debugger.js
diff --git a/src/mirror-debugger.js b/src/mirror-debugger.js
index e717f6e0706fc232a2c252deb848b51243871b6e..897413cfda535284fefe7b5fc2361108c20fb958 100644
--- a/src/mirror-debugger.js
+++ b/src/mirror-debugger.js
@@ -81,8 +81,6 @@ function MakeMirror(value, opt_transient) {
     mirror = new ErrorMirror(value);
   } else if (IS_SCRIPT(value)) {
     mirror = new ScriptMirror(value);
-  } else if (IS_MAP(value) || IS_WEAKMAP(value)) {
-    mirror = new MapMirror(value);
   } else if (ObjectIsPromise(value)) {
     mirror = new PromiseMirror(value);
   } else {
@@ -157,7 +155,6 @@ var SCRIPT_TYPE = 'script';
 var CONTEXT_TYPE = 'context';
 var SCOPE_TYPE = 'scope';
 var PROMISE_TYPE = 'promise';
-var MAP_TYPE = 'map';
 
 // Maximum length when sending strings through the JSON protocol.
 var kMaxProtocolStringLength = 80;
@@ -213,7 +210,6 @@ var ScopeType = { Global: 0,
 //         - RegExpMirror
 //         - ErrorMirror
 //         - PromiseMirror
-//         - MapMirror
 //     - PropertyMirror
 //     - InternalPropertyMirror
 //     - FrameMirror
@@ -425,15 +421,6 @@ Mirror.prototype.isScope = function() {
 
 
 /**
- * Check whether the mirror reflects a map.
- * @returns {boolean} True if the mirror reflects a map
- */
-Mirror.prototype.isMap = function() {
-  return this instanceof MapMirror;
-};
-
-
-/**
  * Allocate a handle id for this object.
  */
 Mirror.prototype.allocateHandle_ = function() {
@@ -1266,44 +1253,6 @@ PromiseMirror.prototype.promiseValue = function() {
 };
 
 
-function MapMirror(value) {
-  %_CallFunction(this, value, MAP_TYPE, ObjectMirror);
-}
-inherits(MapMirror, ObjectMirror);
-
-
-/**
- * Returns an array of key/value pairs of a map.
- * This will keep keys alive for WeakMaps.
- *
- * @returns {Array.<Object>} Array of key/value pairs of a map.
- */
-MapMirror.prototype.entries = function() {
-  var result = [];
-
-  if (IS_WEAKMAP(this.value_)) {
-    var entries = %GetWeakMapEntries(this.value_);
-    for (var i = 0; i < entries.length; i += 2) {
-      result.push({
-        key: entries[i],
-        value: entries[i + 1]
-      });
-    }
-    return result;
-  }
-
-  var iter = %_CallFunction(this.value_, builtins.MapEntries);
-  var next;
-  while (!(next = iter.next()).done) {
-    result.push({
-      key: next.value[0],
-      value: next.value[1]
-    });
-  }
-  return result;
-};
-
-
 /**
  * Base mirror object for properties.
  * @param {ObjectMirror} mirror The mirror object having this property