Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/drive.

chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc

Index: chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc
diff --git a/chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc b/chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc
index 19add70a66498e92a3d38693e59d93879b16737b..90293dbe435a0fa1cab96e225433d68cd15ad69b 100644
--- a/chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc
+++ b/chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc
@@ -37,8 +37,8 @@ class TestDelegate : public OperationDelegate {
   }
 
   // OperationDelegate overrides.
-  virtual void OnEntryUpdatedByOperation(const ClientContext& /* context */,
-                                         const std::string& local_id) override {
+  void OnEntryUpdatedByOperation(const ClientContext& /* context */,
+                                 const std::string& local_id) override {
     updated_local_id_ = local_id;
     if (!quit_closure_.is_null())
       quit_closure_.Run();
@@ -58,7 +58,7 @@ class GetFileForSavingOperationTest : public OperationTestBase {
       : OperationTestBase(content::TestBrowserThreadBundle::IO_MAINLOOP) {
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     OperationTestBase::SetUp();
 
     operation_.reset(new GetFileForSavingOperation(