Remove leftover declaration of DOMStorageContext::DeleteSessionOnlyData.

content/browser/in_process_webkit/dom_storage_context.h

Index: content/browser/in_process_webkit/dom_storage_context.h
diff --git a/content/browser/in_process_webkit/dom_storage_context.h b/content/browser/in_process_webkit/dom_storage_context.h
index f084024358410d67c4e0c1b3d95a6bc888ca4b68..05e404043933470b3198d1cf25b8686e51421ea8 100644
--- a/content/browser/in_process_webkit/dom_storage_context.h
+++ b/content/browser/in_process_webkit/dom_storage_context.h
@@ -82,11 +82,6 @@ class CONTENT_EXPORT DOMStorageContext {
   // are not deleted by this method.
   void DeleteDataModifiedSince(const base::Time& cutoff);
 
-  // Delete any local storage files which are allowed to be stored only until
-  // the end of the session. Protected origins, per the SpecialStoragePolicy,
-  // are not deleted by this method.
-  void DeleteSessionOnlyData();
-
   // Deletes a single local storage file.
   void DeleteLocalStorageFile(const FilePath& file_path);