UiBinderWriter#escapeTextForJavaStringLiteral correctly escapes \n and
", but forgets \.

Also, I couldn't see a reason for using replaceAll instead of replace.

Patch by tbroyer@gmail.com
Review by rjrjr@google.com

http://gwt-code-reviews.appspot.com/620804

Review by: robertvawter@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8356 8db76d5a-ed1c-0410-87a9-c151d255dfc7