ResourceFetcherTest: cleanup finalization

third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp

Index: third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp b/third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp
index 5f310469b16d744f48cf3f586509ef242cd48a84..5a59f775fd1e6710cb5410c7745c2b0233b72620 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/FetchTestingPlatformSupport.cpp
@@ -47,7 +47,12 @@ class AssertWebURLLoader : public WebURLLoader {
 FetchTestingPlatformSupport::FetchTestingPlatformSupport()
     : m_urlLoaderMockFactory(new WebURLLoaderMockFactoryImpl(this)) {}
 
-FetchTestingPlatformSupport::~FetchTestingPlatformSupport() = default;
+FetchTestingPlatformSupport::~FetchTestingPlatformSupport() {
+  // Shutdowns WebURLLoaderMockFactory gracefully, serving all pending requests
+  // first, then flushing all registered URLs.
+  m_urlLoaderMockFactory->serveAsynchronousRequests();
+  m_urlLoaderMockFactory->unregisterAllURLs();
+}
 
 MockFetchContext* FetchTestingPlatformSupport::context() {
   if (!m_context) {