Procedures Don't Properly Handle Changing the Case of a Parameter

[BeksOmega]

Problem statement

Changing the case of a procedure causes a console error because the code is calling a function that doesn't exist.

Expected Behavior

You should be able to change the case of a parameter without errors.

Actual Behavior

Errors!

Steps to Reproduce

1. Create a procedure definition block.
2. Open the mutator and add a paramter named lower case x ('x').
3. Select this character and rename it to upper case x ('X').
4. Observe the console error.

Stack Traces

procedures.js:592 Uncaught TypeError: outerWs.renameVarById is not a function
    at Blockly.FieldTextInput.validator_ (procedures.js:592)
    at Blockly.FieldTextInput.Blockly.Field.setValue (field.js:757)
    at Blockly.FieldTextInput.onHtmlInputChange_ (field_textinput.js:361)
    at HTMLInputElement.wrapFunc (blockly.js:481)

Operating System and Browser

I am assuming this is not browser specific.

Additional Information

This line should actually be this.getSourceBlock().renameVarById(model.getId(), varName);

When this is fixed the applicable procedure mocha test should be un-skipped.

[BeksOmega]

Note: Even after you make the suggested change there are still problems with parameter renaming.

Tests should be added to cover the above case as well.