Fix a DCHECK failure in AutocompleteEditModel::OnPopupDataChanged()

chrome/browser/autocomplete/autocomplete.cc

 // Copyright (c) 2010 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 "chrome/browser/autocomplete/autocomplete.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 779 matching lines @@
   }
   latest_result_.CopyFrom(result_);
 }
 
 void AutocompleteController::DeleteMatch(const AutocompleteMatch& match) {
   DCHECK(match.deletable);
   match.provider->DeleteMatch(match);  // This may synchronously call back to
                                        // OnProviderUpdate().
   CommitResult(true);  // Ensure any new result gets committed immediately.  If
                        // it was committed already or hasn't been modified, this
-                       // is harmless.
+                       // is harmless. We need to notify the edit box, because
+                       // the default match may have been changed.
 }
 
 void AutocompleteController::CommitIfQueryHasNeverBeenCommitted() {
   if (!have_committed_during_this_query_)
     CommitResult(true);
 }
 
 void AutocompleteController::OnProviderUpdate(bool updated_matches) {
   CheckIfDone();
   if (updated_matches || done_)
@@ skipping 77 matching lines @@
 void AutocompleteController::CheckIfDone() {
   for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end();
        ++i) {
     if (!(*i)->done()) {
       done_ = false;
       return;
     }
   }
   done_ = true;
 }