Move CancelableTaskTracker to //base/task/CancelableTaskTracker.

chrome/browser/sessions/session_service.h

Index: chrome/browser/sessions/session_service.h
diff --git a/chrome/browser/sessions/session_service.h b/chrome/browser/sessions/session_service.h
index 5a7e41db5311e566fd3f39c1f3429b42801f8329..215083c68d11aa1b91f2dd30f76efdc3b2e1af60 100644
--- a/chrome/browser/sessions/session_service.h
+++ b/chrome/browser/sessions/session_service.h
@@ -11,6 +11,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_vector.h"
+#include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/sessions/base_session_service.h"
@@ -18,7 +19,6 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list_observer.h"
-#include "chrome/common/cancelable_task_tracker.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -193,8 +193,9 @@ class SessionService : public BaseSessionService,
   // Fetches the contents of the last session, notifying the callback when
   // done. If the callback is supplied an empty vector of SessionWindows
   // it means the session could not be restored.
-  CancelableTaskTracker::TaskId GetLastSession(const SessionCallback& callback,
-                                               CancelableTaskTracker* tracker);
+  base::CancelableTaskTracker::TaskId GetLastSession(
+      const SessionCallback& callback,
+      base::CancelableTaskTracker* tracker);
 
   // Overridden from BaseSessionService because we want some UMA reporting on
   // session update activities.