Omnibox: Don't Force Notify Default Match Changed When Expiring Old Matches

chrome/browser/autocomplete/autocomplete_controller.cc

 // Copyright (c) 2012 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_controller.h"
 
 #include <set>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 261 matching lines @@
   // If DeleteMatch resulted in a callback to OnProviderUpdate and we're
   // not done, we might attempt to redisplay the deleted match. Make sure
   // we aren't displaying it by removing any old entries.
   ExpireCopiedEntries();
 }
 
 void AutocompleteController::ExpireCopiedEntries() {
   // The first true makes UpdateResult() clear out the results and
   // regenerate them, thus ensuring that no results from the previous
   // result set remain.
-  // The second true says to pretend the default match changed (even
-  // if it did not).  This may not be necessary but the code has been
-  // like this for a long time and there's probably no great benefit in
-  // changing it.  Classically we have erred on the side of notifying
-  // too often because it hasn't had any major side effects.
-  UpdateResult(true, true);
+  UpdateResult(true, false);
 }
 
 void AutocompleteController::OnProviderUpdate(bool updated_matches) {
   if (in_zero_suggest_) {
     // We got ZeroSuggest results before Start(). Show only those results,
     // because results from other providers are stale.
     result_.Reset();
     result_.AppendMatches(zero_suggest_provider_->matches());
     result_.SortAndCull(input_, profile_);
     NotifyChanged(true);
@@ skipping 206 matching lines @@
   }
   done_ = true;
 }
 
 void AutocompleteController::StartExpireTimer() {
   if (result_.HasCopiedMatches())
     expire_timer_.Start(FROM_HERE,
                         base::TimeDelta::FromMilliseconds(kExpireTimeMS),
                         this, &AutocompleteController::ExpireCopiedEntries);
 }