[SyncFS] Add DriveUploader to SyncEngineContext

chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc

Index: chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc b/chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc
index a1e0be5794a636298e2557f3c228fe5c728aecbb..8926e1339659febc2501176a4d077c1183de32d2 100644
--- a/chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc
+++ b/chrome/browser/sync_file_system/drive_backend/list_changes_task_unittest.cc
@@ -64,6 +64,10 @@ class ListChangesTaskTest : public testing::Test,
     return fake_drive_service_.get();
   }
 
+  virtual drive::DriveUploader* GetDriveUploader() OVERRIDE {
+    return NULL;
+  }
+
   virtual MetadataDatabase* GetMetadataDatabase() OVERRIDE {
     return metadata_database_.get();
   }