Standardize usage of virtual/override/final specifiers.

content/browser/fileapi/sandbox_file_system_backend_unittest.cc

Index: content/browser/fileapi/sandbox_file_system_backend_unittest.cc
diff --git a/content/browser/fileapi/sandbox_file_system_backend_unittest.cc b/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
index ee332f6f3526a44c3627f2c3cf8caafce95ad843..efa7259fd4441a8cd6f48e7f58483696a6c9bf70 100644
--- a/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
+++ b/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
@@ -71,7 +71,7 @@ void DidOpenFileSystem(base::File::Error* error_out,
 
 class SandboxFileSystemBackendTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     ASSERT_TRUE(data_dir_.CreateUniqueTempDir());
     SetUpNewDelegate(CreateAllowFileAccessOptions());
   }