Fix autofill popup controller key press callback registration

Currently, PopupControllerCommon::RegisterKeyPressCallback registers its key
press handler via RenderView. This results in broken key handling with site
isolation. The fix is to use the focused RenderFrame itself.

BUG=688848

Review-Url: https://codereview.chromium.org/2762233004
Cr-Commit-Position: refs/heads/master@{#462381}
27 files changed