Avoid using vtable of destroyed object in MultiBuffer unit test.

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 <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 36 matching lines @@
 
 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() override {
     CHECK_EQ(static_cast<size_t>(1), test_data_providers.erase(this));
   }
-  void SetLoadingToFalse() {
-    // Check that we have not been destroyed first.
-    if (test_data_providers.find(this) != test_data_providers.end()) {
-      loading_ = false;
-    }
-  }
   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(
-            Invoke(this, &TestMultiBufferDataProvider::SetLoadingToFalse));
+        .WillByDefault(Invoke([this]() {
+          // Check that we have not been destroyed first.
+          if (test_data_providers.find(this) != test_data_providers.end()) {
+            this->loading_ = false;
+          }
+        }));
     loading_ = true;
     active_loader_.reset(
         new ActiveLoader(std::unique_ptr<WebURLLoader>(url_loader)));
     if (!on_start_.is_null()) {
       on_start_.Run();
     }
   }
 
   bool loading() const { return loading_; }
   void RunOnStart(base::Closure cb) { on_start_ = cb; }
@@ skipping 1292 matching lines @@
   ReceiveData(kDataSize);
 
   EXPECT_FALSE(data_source_->IsStreaming());
 
   FinishLoading();
   EXPECT_FALSE(loading());
   Stop();
 }
 
 }  // namespace media