Rename OperationObserver to OperationDelegate

chrome/browser/chromeos/drive/file_system/touch_operation.h

Index: chrome/browser/chromeos/drive/file_system/touch_operation.h
diff --git a/chrome/browser/chromeos/drive/file_system/touch_operation.h b/chrome/browser/chromeos/drive/file_system/touch_operation.h
index 7a5151585148d0773466020cbba9a49ad66cd72a..0f55575f08c2475060809631409e37c028abf35f 100644
--- a/chrome/browser/chromeos/drive/file_system/touch_operation.h
+++ b/chrome/browser/chromeos/drive/file_system/touch_operation.h
@@ -31,12 +31,12 @@ class ResourceEntry;
 
 namespace file_system {
 
-class OperationObserver;
+class OperationDelegate;
 
 class TouchOperation {
  public:
   TouchOperation(base::SequencedTaskRunner* blocking_task_runner,
-                 OperationObserver* observer,
+                 OperationDelegate* delegate,
                  internal::ResourceMetadata* metadata);
   ~TouchOperation();
 
@@ -57,7 +57,7 @@ class TouchOperation {
                                       FileError error);
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-  OperationObserver* observer_;
+  OperationDelegate* delegate_;
   internal::ResourceMetadata* metadata_;
 
   // Note: This should remain the last member so it'll be destroyed and