[downloads] Remove DownloadManager::RemoveAllDownloads.

content/public/test/mock_download_manager.h

Index: content/public/test/mock_download_manager.h
diff --git a/content/public/test/mock_download_manager.h b/content/public/test/mock_download_manager.h
index 307a84dcf58248dd9aed950aba5204a076a8260c..2d38450ca15ef6dc319eaf86bb2295564df1f019 100644
--- a/content/public/test/mock_download_manager.h
+++ b/content/public/test/mock_download_manager.h
@@ -104,7 +104,6 @@ class MockDownloadManager : public DownloadManager {
                int(const base::Callback<bool(const GURL&)>& url_filter,
                    base::Time remove_begin,
                    base::Time remove_end));
-  MOCK_METHOD0(RemoveAllDownloads, int());
   MOCK_METHOD1(DownloadUrlMock, void(DownloadUrlParameters*));
   void DownloadUrl(std::unique_ptr<DownloadUrlParameters> params) override {
     DownloadUrlMock(params.get());