UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Steps to reproduce the problem:
Code like this:
```
(function() {
    console.log(`parentScope: ${this.fake}`);

    (() => {
        console.log(`childScope: ${this.fake}`);
        debugger;
    }).call({ innerFake: "innerFakeValue" });

}).call({ fake: "fakeValue" });
```

Debug this code with Chrome DevTools. At 'debugger', check the value of 'this' in the Scope pane, and evaluate 'this' in the console.

What is the expected behavior?
At 'debugger', 'this' is { fake: 'fakeValue' }

What went wrong?
In the Scope pane, 'this' is shown as being { innerFake: 'innerFakeValue' }. Since you can't override 'this' in an arrow function with call/apply, this is wrong.

Did this work before? N/A 

Chrome version: 54.0.2840.71  Channel: stable
OS Version: OS X 10.12.1
Flash Version: Shockwave Flash 23.0 r0

From https://github.com/Microsoft/vscode/issues/13967
 

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	Screen Shot 2016-10-31 at 1.42.43 PM.png 48.0 KB View Download