Move CancelableTaskTracker to //base/task/CancelableTaskTracker.

chrome/browser/sessions/persistent_tab_restore_service.cc

Index: chrome/browser/sessions/persistent_tab_restore_service.cc
diff --git a/chrome/browser/sessions/persistent_tab_restore_service.cc b/chrome/browser/sessions/persistent_tab_restore_service.cc
index 0aa9c3c03bad8809137a64184b657e1d584ecd9f..e9feebb97788b2a896c253e371b998e84314577e 100644
--- a/chrome/browser/sessions/persistent_tab_restore_service.cc
+++ b/chrome/browser/sessions/persistent_tab_restore_service.cc
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/stl_util.h"
+#include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/common/cancelable_request.h"
 #include "chrome/browser/profiles/profile.h"
@@ -23,7 +24,6 @@
 #include "chrome/browser/sessions/session_service.h"
 #include "chrome/browser/sessions/session_service_factory.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
-#include "chrome/common/cancelable_task_tracker.h"
 #include "content/public/browser/session_storage_namespace.h"
 
 namespace {
@@ -231,7 +231,7 @@ class PersistentTabRestoreService::Delegate
   ScopedVector<Entry> staging_entries_;
 
   // Used when loading previous tabs/session and open tabs/session.
-  CancelableTaskTracker cancelable_task_tracker_;
+  base::CancelableTaskTracker cancelable_task_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(Delegate);
 };