Use std::unique_ptr<> for WebTaskRunner::clone

third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 138 matching lines @@
     response.setMimeType(mimeType);
     imageResource->responseReceived(response, nullptr);
     imageResource->appendData(reinterpret_cast<const char*>(data.data()), data.size());
     imageResource->finish();
 }
 
 class MockTaskRunner : public blink::WebTaskRunner {
     void postTask(const WebTraceLocation&, Task*) override { }
     void postDelayedTask(const WebTraceLocation&, Task*, double) override { }
     bool runsTasksOnCurrentThread() override { return true; }
-    WebTaskRunner* clone() override { return nullptr; }
+    std::unique_ptr<WebTaskRunner> clone() override { return nullptr; }
     double virtualTimeSeconds() const override { return 0.0; }
     double monotonicallyIncreasingVirtualTimeSeconds() const override { return 0.0; }
 };
 
 }
 
 class ImageResourceTestMockFetchContext : public FetchContext {
 public:
     static ImageResourceTestMockFetchContext* create()
     {
@@ skipping 445 matching lines @@
     Persistent<MockResourceClient> client2 = new MockResourceClient(imageResource);
 
     ASSERT_TRUE(imageResource->hasImage());
     EXPECT_FALSE(imageResource->getImage()->isNull());
     EXPECT_EQ(1, imageResource->getImage()->width());
     EXPECT_EQ(1, imageResource->getImage()->height());
     EXPECT_TRUE(client2->notifyFinishedCalled());
 }
 
 } // namespace blink