WK2: Spelling tests that rely on getting the marked range or the marked count synchronously fail

[Jessie Berlin]

In WK2, spelling and grammar marking is done asynchronously because it involves cross-process communication.

The current spelling tests assume that they can get the marked range / count directly after adding incorrect spelling or grammar.

http://build.webkit.org/results/Lion%20Intel%20Debug%20(WebKit2%20Tests)/r110712%20(4902)/editing/spelling/markers-pretty-diff.html
http://build.webkit.org/results/Lion%20Intel%20Debug%20(WebKit2%20Tests)/r110712%20(4902)/editing/spelling/spelling-insert-html-pretty-diff.html
http://build.webkit.org/results/Lion%20Intel%20Debug%20(WebKit2%20Tests)/r110712%20(4902)/editing/spelling/spelling-unified-emulation-pretty-diff.html

Note that these tests all pass under WK1:

http://build.webkit.org/results/Lion%20Intel%20Debug%20(Tests)/r110709%20(4458)/results.html

[Radar WebKit Bug Importer]

<rdar://problem/11047832>

[Jessie Berlin]

Committed the expected failing results in http://trac.webkit.org/changeset/110720.