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

chrome/browser/autocomplete/history_provider.h

Index: chrome/browser/autocomplete/history_provider.h
===================================================================
--- chrome/browser/autocomplete/history_provider.h	(revision 151481)
+++ chrome/browser/autocomplete/history_provider.h	(working copy)
@@ -50,6 +50,10 @@
   // trailing whitespace, or if always_prevent_inline_autocomplete is true.
   bool PreventInlineAutocomplete(const AutocompleteInput& input);
 
+  // Finds and removes the match from the current collection of matches and
+  // backing data.
+  void DeleteMatchFromMatches(const AutocompleteMatch& match);
+
   // If true, we always prevent inline autocompletions.
   bool always_prevent_inline_autocomplete_;
 };