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

chrome/browser/autocomplete/history_provider.cc

Index: chrome/browser/autocomplete/history_provider.cc
===================================================================
--- chrome/browser/autocomplete/history_provider.cc	(revision 151481)
+++ chrome/browser/autocomplete/history_provider.cc	(working copy)
@@ -38,8 +38,10 @@
   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) {