Make LevelDBObserver an associated interface to LevelDBWrapper.

content/renderer/dom_storage/local_storage_cached_area.h

Index: content/renderer/dom_storage/local_storage_cached_area.h
diff --git a/content/renderer/dom_storage/local_storage_cached_area.h b/content/renderer/dom_storage/local_storage_cached_area.h
index 26779e3859e8bb89319b000d1f76aecb41a89d9d..11915a9b9b983aa2e784154abc87a6e5f48c5349 100644
--- a/content/renderer/dom_storage/local_storage_cached_area.h
+++ b/content/renderer/dom_storage/local_storage_cached_area.h
@@ -11,7 +11,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/strings/nullable_string16.h"
 #include "content/common/leveldb_wrapper.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/associated_binding.h"
 #include "url/gurl.h"
 #include "url/origin.h"
 
@@ -101,7 +101,7 @@ class LocalStorageCachedArea : public mojom::LevelDBObserver,
   bool ignore_all_mutations_ = false;
   std::string get_all_request_id_;
   mojom::LevelDBWrapperPtr leveldb_;
-  mojo::Binding<mojom::LevelDBObserver> binding_;
+  mojo::AssociatedBinding<mojom::LevelDBObserver> binding_;
   LocalStorageCachedAreas* cached_areas_;
   std::map<std::string, LocalStorageArea*> areas_;
   base::WeakPtrFactory<LocalStorageCachedArea> weak_factory_;