Don't demote top match for certain match types.

chrome/browser/autocomplete/autocomplete_match.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_match.h"
 
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 26 matching lines @@
   0x2029,  // Paragraph separator
   0
 };
 
 AutocompleteMatch::AutocompleteMatch()
     : provider(NULL),
       relevance(0),
       typed_count(-1),
       deletable(false),
       allowed_to_be_default_match(false),
+      demoteable(true),
       transition(content::PAGE_TRANSITION_GENERATED),
       is_history_what_you_typed_match(false),
       type(AutocompleteMatchType::SEARCH_WHAT_YOU_TYPED),
       starred(false),
       from_previous(false) {
 }
 
 AutocompleteMatch::AutocompleteMatch(AutocompleteProvider* provider,
                                      int relevance,
                                      bool deletable,
                                      Type type)
     : provider(provider),
       relevance(relevance),
       typed_count(-1),
       deletable(deletable),
       allowed_to_be_default_match(false),
+      demoteable(true),
       transition(content::PAGE_TRANSITION_TYPED),
       is_history_what_you_typed_match(false),
       type(type),
       starred(false),
       from_previous(false) {
 }
 
 AutocompleteMatch::AutocompleteMatch(const AutocompleteMatch& match)
     : provider(match.provider),
       relevance(match.relevance),
       typed_count(match.typed_count),
       deletable(match.deletable),
       fill_into_edit(match.fill_into_edit),
       inline_autocompletion(match.inline_autocompletion),
       allowed_to_be_default_match(match.allowed_to_be_default_match),
+      demoteable(match.demoteable),
       destination_url(match.destination_url),
       stripped_destination_url(match.stripped_destination_url),
       contents(match.contents),
       contents_class(match.contents_class),
       description(match.description),
       description_class(match.description_class),
       transition(match.transition),
       is_history_what_you_typed_match(match.is_history_what_you_typed_match),
       type(match.type),
       associated_keyword(match.associated_keyword.get() ?
@@ skipping 15 matching lines @@
   if (this == &match)
     return *this;
 
   provider = match.provider;
   relevance = match.relevance;
   typed_count = match.typed_count;
   deletable = match.deletable;
   fill_into_edit = match.fill_into_edit;
   inline_autocompletion = match.inline_autocompletion;
   allowed_to_be_default_match = match.allowed_to_be_default_match;
+  demoteable = match.demoteable;
   destination_url = match.destination_url;
   stripped_destination_url = match.stripped_destination_url;
   contents = match.contents;
   contents_class = match.contents_class;
   description = match.description;
   description_class = match.description_class;
   transition = match.transition;
   is_history_what_you_typed_match = match.is_history_what_you_typed_match;
   type = match.type;
   associated_keyword.reset(match.associated_keyword.get() ?
@@ skipping 362 matching lines @@
         << " is unsorted in relation to last offset of " << last_offset
         << ". Provider: " << provider_name << ".";
     DCHECK_LT(i->offset, text.length())
         << " Classification of [" << i->offset << "," << text.length()
         << "] is out of bounds for \"" << text << "\". Provider: "
         << provider_name << ".";
     last_offset = i->offset;
   }
 }
 #endif