Some more virtual/override updates.

mojo/public/cpp/bindings/tests/struct_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
@@ skipping 11 matching lines @@
 
 void CheckRect(const Rect& rect, int32_t factor = 1) {
   EXPECT_EQ(1 * factor, rect.x);
   EXPECT_EQ(2 * factor, rect.y);
   EXPECT_EQ(10 * factor, rect.width);
   EXPECT_EQ(20 * factor, rect.height);
 }
 
 class StructTest : public testing::Test {
  public:
-  virtual ~StructTest() {}
+  ~StructTest() override {}
 
  private:
   Environment env_;
 };
 
 }  // namespace
 
 TEST_F(StructTest, Rect) {
   RectPtr rect;
   EXPECT_TRUE(rect.is_null());
@@ skipping 125 matching lines @@
 
   NamedRegionPtr region2;
   Deserialize_(data, &region2);
 
   EXPECT_TRUE(region2->name.is_null());
   EXPECT_TRUE(region2->rects.is_null());
 }
 
 }  // namespace test
 }  // namespace mojo