Convert SessionService to use new CancelableTaskTracker

chrome/browser/sessions/session_backend.cc

Index: chrome/browser/sessions/session_backend.cc
diff --git a/chrome/browser/sessions/session_backend.cc b/chrome/browser/sessions/session_backend.cc
index 8540a791ba9a06d52d369251e23332ebb2c7909a..7829d8bfe2c531ffd558d3a0e0a6a39c5592f94b 100644
--- a/chrome/browser/sessions/session_backend.cc
+++ b/chrome/browser/sessions/session_backend.cc
@@ -244,12 +244,16 @@ void SessionBackend::AppendCommands(
 }
 
 void SessionBackend::ReadLastSessionCommands(
-    scoped_refptr<BaseSessionService::InternalGetCommandsRequest> request) {
-  if (request->canceled())
+    const CancelableTaskTracker::IsCanceledCallback& is_canceled,
+    const BaseSessionService::InternalGetCommandsCallback& callback) {
+  if (is_canceled.Run())
     return;
+
   Init();
-  ReadLastSessionCommandsImpl(&(request->commands));
-  request->ForwardResult(request->handle(), request);
+
+  ScopedVector<SessionCommand> commands;
+  ReadLastSessionCommandsImpl(&(commands.get()));
+  callback.Run(commands.Pass());
 }
 
 bool SessionBackend::ReadLastSessionCommandsImpl(
@@ -294,15 +298,6 @@ void SessionBackend::MoveCurrentSessionToLastSession() {
   ResetFile();
 }
 
-void SessionBackend::ReadCurrentSessionCommands(
-    scoped_refptr<BaseSessionService::InternalGetCommandsRequest> request) {
-  if (request->canceled())
-    return;
-  Init();
-  ReadCurrentSessionCommandsImpl(&(request->commands));
-  request->ForwardResult(request->handle(), request);
-}
-
 bool SessionBackend::ReadCurrentSessionCommandsImpl(
     std::vector<SessionCommand*>* commands) {
   Init();