[downloads] Remove DownloadManager::RemoveAllDownloads.

content/browser/download/download_manager_impl.h

Index: content/browser/download/download_manager_impl.h
diff --git a/content/browser/download/download_manager_impl.h b/content/browser/download/download_manager_impl.h
index e21dc123a3f764144a796856c6a88213d1e75b36..859fe17a774d60717c6da01a929d3e9a7bff845d 100644
--- a/content/browser/download/download_manager_impl.h
+++ b/content/browser/download/download_manager_impl.h
@@ -78,7 +78,6 @@ class CONTENT_EXPORT DownloadManagerImpl : public DownloadManager,
       const base::Callback<bool(const GURL&)>& url_filter,
       base::Time remove_begin,
       base::Time remove_end) override;
-  int RemoveAllDownloads() override;
   void DownloadUrl(std::unique_ptr<DownloadUrlParameters> params) override;
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
@@ -140,7 +139,6 @@ class CONTENT_EXPORT DownloadManagerImpl : public DownloadManager,
   using DownloadSet = std::set<DownloadItem*>;
   using DownloadGuidMap = std::unordered_map<std::string, DownloadItemImpl*>;
   using DownloadItemImplVector = std::vector<DownloadItemImpl*>;
-  using DownloadRemover = base::Callback<bool(const DownloadItemImpl*)>;
 
   // For testing.
   friend class DownloadManagerTest;
@@ -175,9 +173,6 @@ class CONTENT_EXPORT DownloadManagerImpl : public DownloadManager,
   // observer.
   void OnFileExistenceChecked(uint32_t download_id, bool result);
 
-  // Remove all downloads for which |remover| returns true.
-  int RemoveDownloads(const DownloadRemover& remover);
-
   // Overridden from DownloadItemImplDelegate
   // (Note that |GetBrowserContext| are present in both interfaces.)
   void DetermineDownloadTarget(DownloadItemImpl* item,