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

chrome/browser/chromeos/drive/file_system/operation_test_base.h

Index: chrome/browser/chromeos/drive/file_system/operation_test_base.h
diff --git a/chrome/browser/chromeos/drive/file_system/operation_test_base.h b/chrome/browser/chromeos/drive/file_system/operation_test_base.h
index a3f6e211db41bd91a2cf42dc70c1372aecb36795..a368f23e3aff8eada9aca16e10b474e2af1b6b9a 100644
--- a/chrome/browser/chromeos/drive/file_system/operation_test_base.h
+++ b/chrome/browser/chromeos/drive/file_system/operation_test_base.h
@@ -56,16 +56,13 @@ class OperationTestBase : public testing::Test {
     ~LoggingDelegate();
 
     // OperationDelegate overrides.
-    virtual void OnFileChangedByOperation(
-        const FileChange& changed_files) override;
-    virtual void OnEntryUpdatedByOperation(
-        const ClientContext& context,
-        const std::string& local_id) override;
-    virtual void OnDriveSyncError(DriveSyncErrorType type,
-                                  const std::string& local_id) override;
-    virtual bool WaitForSyncComplete(
-        const std::string& local_id,
-        const FileOperationCallback& callback) override;
+    void OnFileChangedByOperation(const FileChange& changed_files) override;
+    void OnEntryUpdatedByOperation(const ClientContext& context,
+                                   const std::string& local_id) override;
+    void OnDriveSyncError(DriveSyncErrorType type,
+                          const std::string& local_id) override;
+    bool WaitForSyncComplete(const std::string& local_id,
+                             const FileOperationCallback& callback) override;
 
     // Gets the set of changed paths.
     const FileChange& get_changed_files() { return changed_files_; }
@@ -95,10 +92,10 @@ class OperationTestBase : public testing::Test {
 
   OperationTestBase();
   explicit OperationTestBase(int test_thread_bundle_options);
-  virtual ~OperationTestBase();
+  ~OperationTestBase() override;
 
   // testing::Test overrides.
-  virtual void SetUp() override;
+  void SetUp() override;
 
   // Returns the path of the temporary directory for putting test files.
   base::FilePath temp_dir() const { return temp_dir_.path(); }