toast: announces "remove: " before "Alert", the toast, and toast content

[EamonKavanagh]

Actual Behavior:

• When an mdToast dialog pops up, it's announced twice by the screen reader. The transcript is:

[text in mdToast]
Alert
[text in mdToast]
Alert

• The text of the toast and alert only announced once.

CodePen (or steps to reproduce the issue): *

• See the demo on the Angular Material page here: https://material.angularjs.org/latest/demo/toast
• Tested using ChromeVox 53.0.2784.5 and we've had reports of this using JAWS as well.

AngularJS Versions: *
1.6.4-local+sha.617b36117

Additional Information:

• Chrome 59.0.3071.115

[Splaktar]

I am only seeing the Toast announced once with Version 68.0.3440.87 (Official Build) beta (64-bit). However, I am hearing "removed: " as the first thing when a toast is displayed.

I am not hearing "remove: " announced with VoiceOver on macOS.

[Splaktar]

This issue doesn't mention the version of AngularJS Material where this original issue was found. I am guessing 1.1.3 or 1.1.4?

[Splaktar]

This looks like a Chromevox bug so I've opened https://bugs.chromium.org/p/chromium/issues/detail?id=873324 to track this issue.