Revert 98168, it caused compile errors on mac:

chrome/browser/safe_browsing/browser_features.cc

Index: chrome/browser/safe_browsing/browser_features.cc
===================================================================
--- chrome/browser/safe_browsing/browser_features.cc	(revision 98169)
+++ chrome/browser/safe_browsing/browser_features.cc	(working copy)
@@ -1,33 +0,0 @@
-// Copyright (c) 2011 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.
-
-#include "chrome/browser/safe_browsing/browser_features.h"
-
-namespace safe_browsing {
-namespace features {
-const char kUrlHistoryVisitCount[] = "UrlHistoryVisitCount";
-const char kUrlHistoryTypedCount[] = "UrlHistoryTypedCount";
-const char kUrlHistoryLinkCount[] = "UrlHistoryLinkCount";
-const char kUrlHistoryVisitCountMoreThan24hAgo[] =
-    "UrlHistoryVisitCountMoreThan24hAgo";
-const char kHttpHostVisitCount[] = "HttpHostVisitCount";
-const char kHttpsHostVisitCount[] = "HttpsHostVisitCount";
-const char kFirstHttpHostVisitMoreThan24hAgo[] =
-    "FirstHttpHostVisitMoreThan24hAgo";
-const char kFirstHttpsHostVisitMoreThan24hAgo[] =
-    "FirstHttpsHostVisitMoreThan24hAgo";
-
-const char kHostPrefix[] = "Host";
-const char kRedirectPrefix[] = "Redirect";
-const char kReferrer[] = "Referrer";
-const char kHasSSLReferrer[] = "HasSSLReferrer";
-const char kPageTransitionType[] = "PageTransitionType";
-const char kIsFirstNavigation[] = "IsFirstNavigation";
-const char kBadIpFetch[] = "BadIpFetch=";
-const char kSafeBrowsingMaliciousUrl[] = "SafeBrowsingMaliciousUrl=";
-const char kSafeBrowsingOriginalUrl[] = "SafeBrowsingOriginalUrl=";
-const char kSafeBrowsingIsSubresource[] = "SafeBrowsingIsSubresource";
-const char kSafeBrowsingThreatType[] = "SafeBrowsingThreatType";
-}  // namespace features
-}  // namespace safe_browsing