Enforce marking "override" for functions overriding Blink.

media/blink/multibuffer_data_source_unittest.cc

 // Copyright 2013 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 "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "media/base/media_log.h"
 #include "media/base/mock_filters.h"
 #include "media/base/test_helpers.h"
@@ skipping 29 matching lines @@
 class TestMultiBufferDataProvider;
 
 std::set<TestMultiBufferDataProvider*> test_data_providers;
 
 class TestMultiBufferDataProvider : public ResourceMultiBufferDataProvider {
  public:
   TestMultiBufferDataProvider(UrlData* url_data, MultiBuffer::BlockId pos)
       : ResourceMultiBufferDataProvider(url_data, pos), loading_(false) {
     CHECK(test_data_providers.insert(this).second);
   }
-  ~TestMultiBufferDataProvider() {
+  ~TestMultiBufferDataProvider() override {
     CHECK_EQ(static_cast<size_t>(1), test_data_providers.erase(this));
   }
   void Start() override {
     // Create a mock active loader.
     // Keep track of active loading state via loadAsynchronously() and cancel().
     NiceMock<MockWebURLLoader>* url_loader = new NiceMock<MockWebURLLoader>();
     ON_CALL(*url_loader, cancel()).WillByDefault(Assign(&loading_, false));
     loading_ = true;
     active_loader_.reset(
         new ActiveLoader(scoped_ptr<WebURLLoader>(url_loader)));
@@ skipping 1135 matching lines @@
   ASSERT_TRUE(active_loader());
 
   EXPECT_CALL(*this, ReadCallback(kDataSize));
   EXPECT_CALL(host_, AddBufferedByteRange(0, kDataSize * 2));
   ReceiveData(kDataSize);
 
   EXPECT_FALSE(active_loader_allownull());
 }
 
 }  // namespace media