Remove refptr usages from SpellCheckHost

chrome/browser/spellchecker/spellcheck_profile.cc

Index: chrome/browser/spellchecker/spellcheck_profile.cc
diff --git a/chrome/browser/spellchecker/spellcheck_profile.cc b/chrome/browser/spellchecker/spellcheck_profile.cc
index d5c4de485c5593abdc503b55abec6682ce31d9fb..9874a2fe3019ec1ed59c0c5311c2bd6ccbe5c3fc 100644
--- a/chrome/browser/spellchecker/spellcheck_profile.cc
+++ b/chrome/browser/spellchecker/spellcheck_profile.cc
@@ -50,13 +50,13 @@ SpellCheckProfile::ReinitializeResult SpellCheckProfile::ReinitializeHost(
   bool host_deleted = false;
   if (host_.get()) {
     host_->UnsetProfile();
-    host_ = NULL;
+    host_.reset();
     host_deleted = true;
   }
 
   if (enable) {
     // Retrieve the (perhaps updated recently) dictionary name from preferences.
-    host_ = CreateHost(this, language, request_context, metrics_.get());
+    host_.reset(CreateHost(this, language, request_context, metrics_.get()));
     return REINITIALIZE_CREATED_HOST;
   }