Fixes issue 2274. Our history tokens weren't always being escaped, causing
equal tokens to not compare as equal, so spurious History entries.

Modified:
  trunk/user/src/com/google/gwt/user/client/impl/HistoryImplIE6.java

patch by: ajr
reviewed by: jgw



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2755 8db76d5a-ed1c-0410-87a9-c151d255dfc7