[Autofill] Put Autofill Profile Cleanup behing a feature flag.

components/autofill/core/browser/personal_data_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/core/browser/personal_data_manager.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <list>
 #include <map>
@@ skipping 906 matching lines @@
     if (!matching_profile_found &&
         !new_profile.PrimaryValue(app_locale_).empty() &&
         existing_profile->SaveAdditionalInfo(new_profile, app_locale)) {
       // Unverified profiles should always be updated with the newer data,
       // whereas verified profiles should only ever be overwritten by verified
       // data.  If an automatically aggregated profile would overwrite a
       // verified profile, just drop it.
       matching_profile_found = true;
       guid = existing_profile->guid();
 
-      // Look for duplicates of |existing_profile| to merge into.
-      FindMergeAndDeleteDuplicateProfiles(existing_profiles, existing_profile);
+      if (IsAutofillProfileCleanupEnabled()) {
+        // Look for duplicates of |existing_profile| to merge into.
+        FindMergeAndDeleteDuplicateProfiles(existing_profiles,
+                                            existing_profile);
+      }
 
       // We set the modification date so that immediate requests for profiles
       // will properly reflect the fact that this profile has been modified
       // recently. After writing to the database and refreshing the local copies
       // the profile will have a very slightly newer time reflecting what's
       // actually stored in the database.
       existing_profile->set_modification_date(base::Time::Now());
     }
     merged_profiles->push_back(*existing_profile);
   }
@@ skipping 637 matching lines @@
 
         // Now try to merge the new resulting profile with the rest of the
         // existing profiles.
         profile_to_merge = existing_profile;
       }
     }
   }
 }
 
 }  // namespace autofill