Replace the DownloadFileManager with direct ownership of DownloadFileImpl

content/browser/download/mock_download_file.cc

Index: content/browser/download/mock_download_file.cc
diff --git a/content/browser/download/mock_download_file.cc b/content/browser/download/mock_download_file.cc
index 233d95e046b122362fcb8c83e1a9433751a08ede..74e560bad8af335f2411bb40704a7551d4743ddf 100644
--- a/content/browser/download/mock_download_file.cc
+++ b/content/browser/download/mock_download_file.cc
@@ -8,11 +8,19 @@
 using ::testing::_;
 using ::testing::Return;
 
+namespace {
+
+void SuccessRun(const content::DownloadFile::InitializeCallback& callback) {
+  callback.Run(content::DOWNLOAD_INTERRUPT_REASON_NONE);
+}
+
+}  // namespace
+
 MockDownloadFile::MockDownloadFile() {
   // This is here because |Initialize()| is normally called right after
   // construction.
-  ON_CALL(*this, Initialize())
-      .WillByDefault(Return(content::DOWNLOAD_INTERRUPT_REASON_NONE));
+  ON_CALL(*this, Initialize(_))
+      .WillByDefault(::testing::Invoke(SuccessRun));
 }
 
 MockDownloadFile::~MockDownloadFile() {