Rename OperationObserver to OperationDelegate

chrome/browser/chromeos/drive/sync/entry_revert_performer.h

Index: chrome/browser/chromeos/drive/sync/entry_revert_performer.h
diff --git a/chrome/browser/chromeos/drive/sync/entry_revert_performer.h b/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
index 2e8890258d99904b028d1f9fbd4d339fc9bdc988..db49899cd19c52f89409f1f7fbfb26c63a4d1403 100644
--- a/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
+++ b/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
@@ -30,7 +30,7 @@ class ResourceEntry;
 struct ClientContext;
 
 namespace file_system {
-class OperationObserver;
+class OperationDelegate;
 }  // namespace file_system
 
 namespace internal {
@@ -41,7 +41,7 @@ class ResourceMetadata;
 class EntryRevertPerformer {
  public:
   EntryRevertPerformer(base::SequencedTaskRunner* blocking_task_runner,
-                       file_system::OperationObserver* observer,
+                       file_system::OperationDelegate* delegate,
                        JobScheduler* scheduler,
                        ResourceMetadata* metadata);
   ~EntryRevertPerformer();
@@ -74,7 +74,7 @@ class EntryRevertPerformer {
                                     FileError error);
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-  file_system::OperationObserver* observer_;
+  file_system::OperationDelegate* delegate_;
   JobScheduler* scheduler_;
   ResourceMetadata* metadata_;