Platform incorrectly detects Chrome for iOS browsers

[rotobash]

Reproduction

https://stackblitz.com/edit/components-issue-wmz3pi

Steps to reproduce:

1. Visit on "Chrome for iOS" browser

Expected Behavior

When browsing a site with Chrome for iOS on mobile platform.WEBKIT should be true platform.SAFARI should be false

Actual Behavior

platform.SAFARI is true

Environment

• Angular:
• CDK/Material: 8.0.0
• Browser(s): Chrome for iOS,
• Operating System (e.g. Windows, macOS, Ubuntu): iOS