[ew] Move operation observers from QuotaUtil to FileSystemBackend.

storage/browser/fileapi/sandbox_file_system_backend.cc

Index: storage/browser/fileapi/sandbox_file_system_backend.cc
diff --git a/storage/browser/fileapi/sandbox_file_system_backend.cc b/storage/browser/fileapi/sandbox_file_system_backend.cc
index 432f595c329fe81f6dcff47cf834e1b4a6642101..ede2e7f8ccac2f84afc4465eddcee65c62fed19f 100644
--- a/storage/browser/fileapi/sandbox_file_system_backend.cc
+++ b/storage/browser/fileapi/sandbox_file_system_backend.cc
@@ -157,6 +157,21 @@ FileSystemQuotaUtil* SandboxFileSystemBackend::GetQuotaUtil() {
   return delegate_;
 }
 
+const UpdateObserverList* SandboxFileSystemBackend::GetUpdateObservers(
+    FileSystemType type) const {
+  return delegate_->GetUpdateObservers(type);
+}
+
+const ChangeObserverList* SandboxFileSystemBackend::GetChangeObservers(
+    FileSystemType type) const {
+  return delegate_->GetChangeObservers(type);
+}
+
+const AccessObserverList* SandboxFileSystemBackend::GetAccessObservers(
+    FileSystemType type) const {
+  return delegate_->GetAccessObservers(type);
+}
+
 SandboxFileSystemBackendDelegate::OriginEnumerator*
 SandboxFileSystemBackend::CreateOriginEnumerator() {
   DCHECK(delegate_);