Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp

Index: third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp b/third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp
index 372dd6a46ba7f271b6cb15708cb07074ebb8d07d..cf094436634503cba1d22806d15449f44d0a8e5b 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp
@@ -182,13 +182,13 @@ class ImageResourceTestMockFetchContext : public FetchContext {
     return ResourceRequestBlockedReason::None;
   }
   bool shouldLoadNewResource(Resource::Type) const override { return true; }
-  WebTaskRunner* loadingTaskRunner() const override { return m_runner.get(); }
+  RefPtr<WebTaskRunner> loadingTaskRunner() const override { return m_runner; }
 
  private:
   ImageResourceTestMockFetchContext()
-      : m_runner(WTF::wrapUnique(new scheduler::FakeWebTaskRunner)) {}
+      : m_runner(adoptRef(new scheduler::FakeWebTaskRunner)) {}
 
-  std::unique_ptr<scheduler::FakeWebTaskRunner> m_runner;
+  RefPtr<scheduler::FakeWebTaskRunner> m_runner;
 };
 
 // Convenience class that registers a mocked URL load on construction, and