Frameworks/base: Remove unnecessary Pattern instance

Using a static Pattern in ActivityThread prevents compile-time
initialization of ActivityThread and GestureDetector, which depends
on the former.

It is also not efficient, as String.split has a fast path for simple
splits.

Bug: 19542228

Change-Id: I5bb843c08c81e0d259bb8afafa87a8467bb1730e
1 file changed