Remove base::ScopedPtrHashMap from chrome/browser/sync_file_system/drive_backend/

chrome/browser/sync_file_system/drive_backend/sync_task_manager.h

Index: chrome/browser/sync_file_system/drive_backend/sync_task_manager.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_task_manager.h b/chrome/browser/sync_file_system/drive_backend/sync_task_manager.h
index 364383df22fd6eccc7cee3807447e67bfd76c4e8..7531682ea13c93c4fe084541411eb107965f591e 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_task_manager.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_task_manager.h
@@ -10,10 +10,10 @@
 
 #include <memory>
 #include <queue>
+#include <unordered_map>
 #include <vector>
 
 #include "base/callback.h"
-#include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequence_checker.h"
@@ -186,7 +186,7 @@ class SyncTaskManager {
 
   // Owns running backgrounded SyncTask to cancel the task on SyncTaskManager
   // deletion.
-  base::ScopedPtrHashMap<int64_t, std::unique_ptr<SyncTask>>
+  std::unordered_map<int64_t, std::unique_ptr<SyncTask>>
       running_background_tasks_;
 
   size_t maximum_background_task_;