Revert 152946 - Replace HistoryQuickProvider protobuf-based caching with an SQLite-based database.

chrome/browser/autocomplete/history_quick_provider.cc

Index: chrome/browser/autocomplete/history_quick_provider.cc
===================================================================
--- chrome/browser/autocomplete/history_quick_provider.cc	(revision 152962)
+++ chrome/browser/autocomplete/history_quick_provider.cc	(working copy)
@@ -147,13 +147,8 @@
   }
 }
 
-void HistoryQuickProvider::DeleteMatch(const AutocompleteMatch& match) {
-  DCHECK(match.deletable);
-  DCHECK(match.destination_url.is_valid());
-  // Delete the match from the InMemoryURLIndex.
-  GetIndex()->DeleteURL(match.destination_url);
-  DeleteMatchFromMatches(match);
-}
+// TODO(mrossetti): Implement this function. (Will happen in next CL.)
+void HistoryQuickProvider::DeleteMatch(const AutocompleteMatch& match) {}
 
 HistoryQuickProvider::~HistoryQuickProvider() {}