Omnibox: Make HistoryQuick provider not re-issue queries if |minimal_changes| is true

chrome/browser/autocomplete/history_quick_provider.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/history_quick_provider.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 100 matching lines @@
       inlining_option, NUM_OPTIONS);
 
   reorder_for_inlining_ = CommandLine::ForCurrentProcess()->
       GetSwitchValueASCII(switches::
                           kOmniboxHistoryQuickProviderReorderForInlining) ==
       switches::kOmniboxHistoryQuickProviderReorderForInliningEnabled;
 }
 
 void HistoryQuickProvider::Start(const AutocompleteInput& input,
                                  bool minimal_changes) {
+  if (minimal_changes)
+    return;
   matches_.clear();
   if (disabled_)
     return;
 
   // Don't bother with INVALID and FORCED_QUERY.  Also pass when looking for
   // BEST_MATCH and there is no inline autocompletion because none of the HQP
   // matches can score highly enough to qualify.
   if ((input.type() == AutocompleteInput::INVALID) ||
       (input.type() == AutocompleteInput::FORCED_QUERY) ||
       (input.matches_requested() == AutocompleteInput::BEST_MATCH &&
@@ skipping 259 matching lines @@
     do {
       offset += matches[i].length;
       ++i;
     } while ((i < match_count) && (offset == matches[i].offset));
     if (offset < text_length)
       spans.push_back(ACMatchClassification(offset, url_style));
   }
 
   return spans;
 }