https://bugs.webkit.org/show_bug.cgi?id=114872

Reviewed by Gustavo Noronha Silva.

Source/WebCore:

Re-implement these functions without using GailTextUtil nor Pango.

* accessibility/atk/WebKitAccessibleInterfaceText.cpp:
(lineAtPositionForAtkBoundary): New helper function to find the
line at a given position considering values of AtkTextBoundary.
(webkitAccessibleTextLineForBoundary): New function,
implementing atk_text_get_text_*_offset for LINE.
(webkitAccessibleTextGetTextForOffset): Replace usage of Gail for
LINE boundaries with webkitAccessibleTextLineForBoundary().

Source/WebKit/gtk:

Fixed wrong unit test.

* tests/testatk.c:
(testWebkitAtkGetTextAtOffsetWithPreformattedText): This test was
reporting a trailing '\n' for some reason for a <pre> block, which
is plainly wrong since, in order to return that, there should be
at least a trailing empty space after that and before the </pre>
closing tag. This is fixed now.
(testWebkitAtkGetTextAtOffsetWithWrappedLines): Uncommented tests
that were previously not passing due to a bug in GailTextUtil.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155516 268f45cc-cd09-0410-ab3c-d52691b4dbfc