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: I1a5fedc54d1bb725597a07f4cfd8d7f6e8627a32