Prepatory CallDetailActivity tweaks.

Incremental CL in changing actions/layout of CallDetailActivity to
move actions such as Block/Edit/Copy out of the overflow menu.

+ Make header at top of Call Detail Activity smaller.
+ Move delete options into actionbar button.
- Delete call list header in CallDetailActivity.

Bug: 24109819
Change-Id: If75f016e14de9e2c5ac8629c4bfa38e2380ce48b