Hook up Reader Mode InfoBar
This change replaces the OverlayPanel UI for Reader Mode in favor of
the InfoBar UI. Some notable changes associated with the UI switch:
- Navigations to distilled content are not retained in history. This
means a backward navigation will skip distilled content and bring
the user to the original page.
- The UI no longer animates or sits on top of the original web page.
- Since Reader Mode is now an infobar, it interacts nicely with other
infobars that may appear.
- All operations in the overflow menu use the base page URL.
- The "Appearance" overflow item is once again available.
- Code complexity has been considerably reduced.
BUG=
710014,
624009
Review-Url:
https://codereview.chromium.org/2878543003
Cr-Commit-Position: refs/heads/master@{#479229}
Committed:
https://chromium.googlesource.com/chromium/src/+/75af3a8ba9bd8724e83d99db0113bc8836b472ae