[chromium] Fix spellcheck regression in context menus
Created attachment 89292 [details] Patch
My original change was incorrect, since the offset is 0 when the first word is the one that's misspelt. The length will be non-zero if there's a misspelling though, per WebSpellCheckClient comments.
Committed r83660: <http://trac.webkit.org/changeset/83660>