Fix for Issue 6431 "Two issues about Vietnamese Spell-Checker"....

Fix for Issue 6431 "Two issues about Vietnamese Spell-Checker".
This issue is caused by my stupid mistake in the SpellcheckWordIterator class. Unfortunately, the class does not treat combining characters as word characters for languages which uses combining characters (e.g. Vietnamese, Thai, etc.) because the ICU exemplar set is canonicalized and it does not include combining characters.
To fix this, this change decomposes an exemplar set and also mark the decomposed characters (including combining characters) as word characters.

BUG=6431
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=10087

[brettw, 2009-02-13 16:10:44]

LGTM