Remove out of date todo comments.

core/variable_map.js

@@ -59,7 +59,6 @@ Blockly.VariableMap.prototype.clear = function() {
 
 /**
  * Rename the given variable by updating its name in the variable map.
- * TODO: #468
  * @param {?Blockly.VariableModel} variable Variable to rename.
  * @param {string} newName New variable name.
  */

core/workspace.js

@@ -238,7 +238,6 @@ Blockly.Workspace.prototype.updateVariableStore = function(clear) {
 /**
  * Rename a variable by updating its name in the variable map. Identify the
  * variable to rename with the given variable.
- * TODO: #468
  * @param {?Blockly.VariableModel} variable Variable to rename.
  * @param {string} newName New variable name.
  */
@@ -275,7 +274,6 @@ Blockly.Workspace.prototype.renameVariableInternal_ = function(variable, newName
 /**
  * Rename a variable by updating its name in the variable map. Identify the
  * variable to rename with the given name.
- * TODO: #468
  * @param {string} oldName Variable to rename.
  * @param {string} newName New variable name.
  */

core/workspace_svg.js

@@ -908,7 +908,6 @@ Blockly.WorkspaceSvg.prototype.paste = function(xmlBlock) {
 /**
  * Create a new variable with the given name.  Update the flyout to show the new
  *     variable immediately.
- * TODO: #468
  * @param {string} name The new variable's name.
  * @param {string=} opt_type The type of the variable like 'int' or 'string'.
  *     Does not need to be unique. Field_variable can filter variables based on