Enables the user to select multiple languages for spellchecking (UI)

chrome/browser/spellchecker/spellcheck_factory.cc

Index: chrome/browser/spellchecker/spellcheck_factory.cc
diff --git a/chrome/browser/spellchecker/spellcheck_factory.cc b/chrome/browser/spellchecker/spellcheck_factory.cc
index edbed4055410f4b5c9027f3023dea245aa2fd68d..b4dce1303ada6e556840de3d66e4eddaf472e569 100644
--- a/chrome/browser/spellchecker/spellcheck_factory.cc
+++ b/chrome/browser/spellchecker/spellcheck_factory.cc
@@ -8,6 +8,7 @@
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/spellchecker/spellcheck_service.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/spellcheck_common.h"
 #include "chrome/grit/locale_settings.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
@@ -69,8 +70,11 @@ KeyedService* SpellcheckServiceFactory::BuildServiceInstanceFor(
 void SpellcheckServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   // TODO(estade): IDS_SPELLCHECK_DICTIONARY should be an ASCII string.
+
   user_prefs->RegisterStringPref(
-      prefs::kSpellCheckDictionary,
+      chrome::spellcheck_common::IsMultilingualSpellcheckEnabled()

[groby-ooo-7-16, 2015/06/24 22:12:23]

Hrmpfh. That means we're leaving an old pref lying around. I'd rather we migrate
dictionaries to a list, independent of IsMultilingual. (I'm not sure we _can_
migrate types for preferences, though. Which would be sad...)

I'd also, orthogonal to _that_ decision, like the multi-dictionary method to be
a ListPref

[Julius, 2015/07/06 22:38:53]

Done and Done!

+          ? prefs::kSpellCheckDictionaries
+          : prefs::kSpellCheckDictionary,
       l10n_util::GetStringUTF8(IDS_SPELLCHECK_DICTIONARY));
   user_prefs->RegisterBooleanPref(prefs::kSpellCheckUseSpellingService, false);
   user_prefs->RegisterBooleanPref(