Unreviewed, rolling out r121921.

Unreviewed, rolling out r121921.
http://trac.webkit.org/changeset/121921
https://bugs.webkit.org/show_bug.cgi?id=90648

caused hundreds of crashes on Mac (Requested by pizlo on
#webkit).

Patch by Sheriff Bot <webkit.review.bot@gmail.com> on 2012-07-05

Source/WebCore:

* editing/SurroundingText.cpp:
(WebCore::SurroundingText::SurroundingText):
* editing/TextIterator.cpp:
(WebCore::CharacterIterator::advance):
(WebCore::BackwardsCharacterIterator::advance):

LayoutTests:

* platform/chromium/editing/surrounding-text/surrounding-text-expected.txt:
* platform/chromium/editing/surrounding-text/surrounding-text.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121933 268f45cc-cd09-0410-ab3c-d52691b4dbfc