* 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
removed copy button from search bar and replaced with go action. Had to
remove browser content provider usage as it is not longer included in
the sdk and has been completely removed.
