ui: Cleanup class/struct forward declarations

content/browser/dom_storage/dom_storage_database.cc

Index: content/browser/dom_storage/dom_storage_database.cc
diff --git a/content/browser/dom_storage/dom_storage_database.cc b/content/browser/dom_storage/dom_storage_database.cc
index 5b1b5bd63c3d0d21a1fab3aa4df0471647d98d96..d11aad76540c65aa77527f1bf741c172943aa7ad 100644
--- a/content/browser/dom_storage/dom_storage_database.cc
+++ b/content/browser/dom_storage/dom_storage_database.cc
@@ -158,9 +158,8 @@ bool DOMStorageDatabase::LazyOpen(bool create_if_needed) {
   db_.reset(new sql::Connection());
   db_->set_histogram_tag("DOMStorageDatabase");
 
-  // TODO(shess): The current mitigation for http://crbug.com/537742 stores
-  // state in the meta table, which this database does not use.
-  db_->set_mmap_disabled();
+  // This db does not use [meta] table, store mmap status data elsewhere.
+  db_->set_mmap_alt_status();
 
   if (file_path_.empty()) {
     // This code path should only be triggered by unit tests.