deps(webdriver_js_extender): update webdriver_js_extender to 2.1

[ventuno]

@qiyigg this replaces #4911. All changes should be good now.

Following up on angular/webdriver-js-extender#21, updating webdriver-js-extender to version 2.1.0.

Making the 2 new endpoints to send custom commands to the DevTools debugger server (available since ChromeDriver version 2.30 [1]):

• /chromium/send_command;
• /chromium/send_command_and_get_result.

available for use in protractor.

[1] https://chromium.googlesource.com/chromium/src/+/711de0efbb675bd2a4a28ec47c9194d8e498e600

[ventuno]

Thanks for your help @qiyigg!

[ventuno]

@qiyigg do you know when the next release is planned?

[ventuno]

@qiyigg: ping. Any chance a new release could happen soon?

[qiyigg]

@ventuno I will make a Protractor release by the end of this week. In general, we will make a release in one or two month according to the urgency.

[ventuno]

Thanks a lot @qiyigg, looking forward to it!