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

chrome/browser/diagnostics/sqlite_diagnostics.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_DIAGNOSTICS_SQLITE_DIAGNOSTICS_H_
 #define CHROME_BROWSER_DIAGNOSTICS_SQLITE_DIAGNOSTICS_H_
 
 #include "chrome/browser/diagnostics/diagnostics_test.h"
 
 namespace sql {
   class ErrorDelegate;
 }
 
 // The following five factories create the error handlers that we use when
 // issuing sqlite commands during normal browser operation.
 sql::ErrorDelegate* GetErrorHandlerForCookieDb();
 sql::ErrorDelegate* GetErrorHandlerForHistoryDb();
 sql::ErrorDelegate* GetErrorHandlerForThumbnailDb();
 sql::ErrorDelegate* GetErrorHandlerForTextDb();
 sql::ErrorDelegate* GetErrorHandlerForWebDb();
-sql::ErrorDelegate* GetErrorHandlerForHQPCacheDb();
 
 // Factories for the db integrity tests we run in diagnostic mode.
 DiagnosticTest* MakeSqliteWebDbTest();
 DiagnosticTest* MakeSqliteCookiesDbTest();
 DiagnosticTest* MakeSqliteHistoryDbTest();
 DiagnosticTest* MakeSqliteArchivedHistoryDbTest();
 DiagnosticTest* MakeSqliteThumbnailsDbTest();
-DiagnosticTest* MakeSqliteHQPCacheDbTest();
 DiagnosticTest* MakeSqliteAppCacheDbTest();
 DiagnosticTest* MakeSqliteWebDatabaseTrackerDbTest();
 
 #endif  // CHROME_BROWSER_DIAGNOSTICS_SQLITE_DIAGNOSTICS_H_