Merge the following methods in InCallActivityCommon into InCallActivity:

01. handleDialerKeyDown(int, KeyEvent),
02. onBackPressed(boolean),
03. onDestroy(),
04. onKeyDown(int, KeyEvent),
05. onKeyUp(int, KeyEvent),
06. onPause(),
07. onSaveInstanceState(Bundle),
08. onStart(),
09. onStop(),
10. updateNavigationBar(boolean), and
11. updateTaskDescription().

Note that InCallActivityCommon#handleDialerKeyDown(int, KeyEvent) is merged into InCallActivity#onKeyDown(int, KeyEvent).

This is part of the effort to delete InCallActivityCommon.

Bug: 69272096
Test: None
PiperOrigin-RevId: 176161247
Change-Id: I6e74c7feec5414fb4bc58814eef3bd297d6eb96f