Try to fix a crash in Hunspell.

chrome/third_party/hunspell/dictionaries/README.chromium

Index: chrome/third_party/hunspell/dictionaries/README.chromium
===================================================================
--- chrome/third_party/hunspell/dictionaries/README.chromium	(revision 15859)
+++ chrome/third_party/hunspell/dictionaries/README.chromium	(working copy)
@@ -8,7 +8,7 @@
 
 The .bdic files are binary files, generated from the corresponding .dic and .aff files, using convert_dict (chrome\tools\convert_dict). These binary files are used by the spellchecker. The .dic_delta files are used to add words which are not there in the .dic files. Irrespective of the encoding of the corresponding .dic file, the .dic_delta files are encoded as UTF-8.
 
-The final binary file, .bdic, is generated with words from the .dic and additional words from the .dic_delta file. In order to get the current-most bdic file versions, it is a good idea to rebuild them using convert_dict from the .dic, .aff and .dic_delta files in this folder.
+The final binary file, .bdic, is generated with words from the .dic and additional words from the .dic_delta file. In order to get the current-most bdic file versions, it is a good idea to rebuild them using convert_dict from the .dic, .aff and .dic_delta files in this folder. convert_dict takes care of duplicate entries present both in .dic and .dic_delta files.
 
 The README_??_??.txt files contain information about the individual dictionaries, including copyright information.
 
@@ -60,3 +60,7 @@
 lv_LV:	Added words.
 
 hr_HR:	Added words.
+
+NOTE: Until we upgrade our Hunspell to a newer version supporting more 
+than 8 conditions for Affentry, make sure that all the entries in *.aff files
+have 8 or fewer conditions. See http://crbug.com/8551 for details.