[ew] Move operation observers from QuotaUtil to FileSystemBackend.

chrome/browser/media_galleries/fileapi/media_file_system_backend.cc

Index: chrome/browser/media_galleries/fileapi/media_file_system_backend.cc
diff --git a/chrome/browser/media_galleries/fileapi/media_file_system_backend.cc b/chrome/browser/media_galleries/fileapi/media_file_system_backend.cc
index 915654f6c649b636671dd7a7067ff5cbcc1e8ae4..c3e73ce58e0018f3eca68c1cf762b98c1f6cdc1e 100644
--- a/chrome/browser/media_galleries/fileapi/media_file_system_backend.cc
+++ b/chrome/browser/media_galleries/fileapi/media_file_system_backend.cc
@@ -368,3 +368,18 @@ storage::FileSystemQuotaUtil* MediaFileSystemBackend::GetQuotaUtil() {
   // No quota support.
   return NULL;
 }
+
+const storage::UpdateObserverList* MediaFileSystemBackend::GetUpdateObservers(
+    storage::FileSystemType type) const {
+  return NULL;
+}
+
+const storage::ChangeObserverList* MediaFileSystemBackend::GetChangeObservers(
+    storage::FileSystemType type) const {
+  return NULL;
+}
+
+const storage::AccessObserverList* MediaFileSystemBackend::GetAccessObservers(
+    storage::FileSystemType type) const {
+  return NULL;
+}