Remove STLDeleteContainerPairFirstPointers from AutofillDownloadManager

components/autofill/core/browser/autofill_download_manager.h

Index: components/autofill/core/browser/autofill_download_manager.h
diff --git a/components/autofill/core/browser/autofill_download_manager.h b/components/autofill/core/browser/autofill_download_manager.h
index c470614f1874c88d5ff49787bc7a3d2c4e8e8f2d..c1b39b1d58b97e1131c8983be5f1769098d0d834 100644
--- a/components/autofill/core/browser/autofill_download_manager.h
+++ b/components/autofill/core/browser/autofill_download_manager.h
@@ -8,6 +8,7 @@
 #include <stddef.h>
 #include <list>
 #include <map>
+#include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ -135,8 +136,11 @@ class AutofillDownloadManager : public net::URLFetcherDelegate {
 
   // For each requested form for both query and upload we create a separate
   // request and save its info. As url fetcher is identified by its address
-  // we use a map between fetchers and info.
-  std::map<net::URLFetcher*, FormRequestData> url_fetchers_;
+  // we use a map between fetchers and info. The value type is a pair of an
+  // owning pointer to the key and the actual FormRequestData.
+  std::map<net::URLFetcher*,
+           std::pair<std::unique_ptr<net::URLFetcher>, FormRequestData>>
+      url_fetchers_;
 
   // Cached QUERY requests.
   QueryRequestCache cached_forms_;