GitLab

A collection of small fixes towards getting MacViews browser to build, including:
* Modal dialogs expect a NativeView parent.
* Add BrowserNonClientFrameViewFactoryMac.
* Keyboard component not available without Aura.

BUG=425229

Review URL: https://codereview.chromium.org/797413002

Cr-Commit-Position: refs/heads/master@{#308406}