Replace HistoryQuickProvider protobuf-based caching with an SQLite-based database.

chrome/browser/autocomplete/history_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_url_provider.h"
 
 #include <string>
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 20 matching lines @@
   DCHECK(profile_);
   DCHECK(match.deletable);
 
   HistoryService* const history_service =
       HistoryServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
 
   // Delete the match from the history DB.
   DCHECK(history_service);
   DCHECK(match.destination_url.is_valid());
   history_service->DeleteURL(match.destination_url);
+  DeleteMatchFromMatches(match);
+}
 
-  // Delete the match from the current set of matches.
+void HistoryProvider::DeleteMatchFromMatches(const AutocompleteMatch& match) {
   bool found = false;
   for (ACMatches::iterator i(matches_.begin()); i != matches_.end(); ++i) {
     if (i->destination_url == match.destination_url && i->type == match.type) {
       found = true;
       if (i->is_history_what_you_typed_match || i->starred) {
         // We can't get rid of What-You-Typed or Bookmarked matches,
         // but we can make them look like they have no backing data.
         i->deletable = false;
         i->description.clear();
         i->description_class.clear();
@@ skipping 101 matching lines @@
 }
 
 // static
 bool HistoryProvider::PreventInlineAutocomplete(
     const AutocompleteInput& input) {
   return input.prevent_inline_autocomplete() ||
       always_prevent_inline_autocomplete_ ||
       (!input.text().empty() &&
        IsWhitespace(input.text()[input.text().length() - 1]));
 }