Improve correctness of UnicodeEscapingTest.
Splits testClientToServerBMP() into two methods to correctly report failures.
Removes support for Safari2.
Extends WebKit regex to support Safari4.

Patch by: bobv
Review by: jat, jgw

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5666 8db76d5a-ed1c-0410-87a9-c151d255dfc7