If a background tab opened a URL that triggered the intent chooser, and
the user chose to open the URL in the browser, the current tab would
open the URL instead of the originating URL. Using the tab’s hashcode,
the original tab now will open the URL.
* reduce visibility
* remove unused methods and members
* Suppress unused warnings we can ignore
* fixed or ignored deprecation warnings
* Changed HistoryItem to have better hashcode and equals implementations
and removed id member from it as it was unnecessary
* Fix performance problem with loading bookmarksettingsfragment and
properly annotate bookmarklocalsync
* Now using material alertdialog on all versions
* cleaned up some code
* fixed lint issues and other inspection related problems
* Attempted to fix bugs found
