Remove refptr usages from SpellCheckHost

chrome/browser/spellchecker/spellcheck_host_impl.h

Index: chrome/browser/spellchecker/spellcheck_host_impl.h
diff --git a/chrome/browser/spellchecker/spellcheck_host_impl.h b/chrome/browser/spellchecker/spellcheck_host_impl.h
index 30c217cb61023afbbd1f7844c4e2b03a83be3988..0187ae775b0a561505d1be02fe039fd75b721d37 100644
--- a/chrome/browser/spellchecker/spellcheck_host_impl.h
+++ b/chrome/browser/spellchecker/spellcheck_host_impl.h
@@ -11,6 +11,7 @@
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/spellchecker/spellcheck_host.h"
 #include "chrome/browser/spellchecker/spellcheck_profile_provider.h"
 #include "content/common/net/url_fetcher.h"
@@ -46,6 +47,8 @@ class SpellCheckHostImpl : public SpellCheckHost,
                      net::URLRequestContextGetter* request_context_getter,
                      SpellCheckHostMetrics* metrics);
 
+  virtual ~SpellCheckHostImpl();
+
   void Initialize();
 
   // SpellCheckHost implementation
@@ -63,8 +66,6 @@ class SpellCheckHostImpl : public SpellCheckHost,
   friend class BrowserThread;
   friend class DeleteTask<SpellCheckHostImpl>;
 
-  virtual ~SpellCheckHostImpl();
-
   // Figure out the location for the dictionary. This is only non-trivial for
   // Windows:
   // The default place whether the spellcheck dictionary can reside is
@@ -161,6 +162,8 @@ class SpellCheckHostImpl : public SpellCheckHost,
   // An optional metrics counter given by the constructor.
   SpellCheckHostMetrics* metrics_;
 
+  base::WeakPtrFactory<SpellCheckHostImpl> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(SpellCheckHostImpl);
 };