[Autofill] No longer pass FormStructure pointers in ParseQueryResponse.

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 86d9a55b10ad1db6c4e63531a191cbe1a26b24ff..b48764c893658b5b9f17d3c8c07e506cd12f985c 100644
--- a/components/autofill/core/browser/autofill_download_manager.h
+++ b/components/autofill/core/browser/autofill_download_manager.h
@@ -38,11 +38,11 @@ class AutofillDownloadManager : public net::URLFetcherDelegate {
   class Observer {
    public:
     // Called when field type predictions are successfully received from the
-    // server. |response_xml| contains the server response for the
-    // |queried_forms|.
+    // server. |response_xml| contains the server response for the forms
+    // represented by |form_signatures|.
     virtual void OnLoadedServerPredictions(
         const std::string& response_xml,
-        const std::vector<FormStructure*>& queried_forms) = 0;
+        const std::vector<std::string>& form_signatures) = 0;
 
     // These notifications are used to help with testing.
     // Called when heuristic either successfully considered for upload and