UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3100.0 Safari/537.36

Steps to reproduce the problem:
1. Open Chrome Dev Tools -> Sources -> Snippets (left toolbar, you may have to click >> to see the menu) -> New Snippet. Paste the following code for your snippet.

var Car = class {
    async drive() {
        // Uncomment the line below to "fix" the issue
        // console.warn("[Car.drive] First line of function:", this);
        (() => {
           console.warn("[Car.drive] Inside Promise: this:", this); // this -> Window
        })();
    }

    navigate() {
        console.info("[Car.navigate] this:", this); // this -> Car
        this.drive();
    }
}

var car = new Car();
car.navigate();

2. Run the snippet.

3. Observe line 6 (The console.warn() statement "[Car.drive] Inside Promise: this") outputs:

     Window

     for this.

Screenshot of Incorrect Result: http://i.imgur.com/yNwvcA6.png

What is the expected behavior?
"this" in line 6 above should be "Car".

Strangely enough, by uncommenting line 4, "this" is assigned correctly.

Screenshot of Correct Result, after using this in the first line of the function: http://i.imgur.com/n4afaA1.png

What went wrong?
This seems to only affect Chrome Canary 60:

Chrome Beta 59, and Chrome Stable 58 are not affected by this issue.

Did this work before? Yes 59

Chrome version: 60.0.3100.0  Channel: canary
OS Version: OS X 10.11.6
Flash Version: 

Version Info
------------

Google Chrome	60.0.3100.0 (Official Build) canary (64-bit)
Revision	f472642fd6c20b63b0f1a2f62564f2aad56f4be3-refs/heads/master@{#471639}

Google Chrome	59.0.3071.47 (Official Build) beta (64-bit)
Revision	11e144fef00160b11b4149197763e8c4387791fb-refs/branch-heads/3071@{#475}