Make Omnibox HistoryURL Provider always aggressive.

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 228 matching lines @@
 extern const char kNoManaged[];
 extern const char kNoProxyServer[];
 extern const char kNoPings[];
 extern const char kNoProtector[];
 extern const char kNoRunningInsecureContent[];
 extern const char kNoServiceAutorun[];
 extern const char kNoStartupWindow[];
 extern const char kNotifyCloudPrintTokenExpired[];
 extern const char kNtpAppInstallHint[];
 extern const char kNumPacThreads[];
-extern const char kOmniboxAggressiveHistoryURL[];
-extern const char kOmniboxAggressiveHistoryURLAuto[];
-extern const char kOmniboxAggressiveHistoryURLEnabled[];
-extern const char kOmniboxAggressiveHistoryURLDisabled[];
 extern const char kOmniboxInlineHistoryQuickProvider[];
 extern const char kOmniboxInlineHistoryQuickProviderAllowed[];
 extern const char kOmniboxInlineHistoryQuickProviderProhibited[];
 extern const char kOnlyBlockSettingThirdPartyCookies[];
 extern const char kOpenInNewWindow[];
 extern const char kOrganicInstall[];
 extern const char kPackExtension[];
 extern const char kPackExtensionKey[];
 extern const char kParentProfile[];
 extern const char kPlaybackMode[];
@@ skipping 149 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_