Roll icu to r90787 to get an upstream regex patch (also independently made by bxx )

BUG=86900
TEST=In debug build, run Chrome and load testcase.htm file (attached to the bug). It should not result in a sad tab.
TBR=jschuh
Review URL: http://codereview.chromium.org/7253044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90794 0039d316-1c4b-4281-b951-d872f2087c98