Add a data-driven unit test to validate autofill profile merging during aggregation.

chrome/browser/autofill/autofill_common_test.cc

Index: chrome/browser/autofill/autofill_common_test.cc
diff --git a/chrome/browser/autofill/autofill_common_test.cc b/chrome/browser/autofill/autofill_common_test.cc
index 6817dbb4a805a992433134d98e75964613844119..c926b8e359da93684c4e1162f848391cf9b7c589 100644
--- a/chrome/browser/autofill/autofill_common_test.cc
+++ b/chrome/browser/autofill/autofill_common_test.cc
@@ -86,8 +86,10 @@ void DisableSystemServices(Profile* profile) {
 
   // Disable auxiliary profiles for unit testing.  These reach out to system
   // services on the Mac.
-  profile->GetPrefs()->SetBoolean(prefs::kAutoFillAuxiliaryProfilesEnabled,
-                                  false);
+  if (profile) {
+    profile->GetPrefs()->SetBoolean(prefs::kAutoFillAuxiliaryProfilesEnabled,
+                                    false);
+  }
 }
 
 }  // namespace autofill_test