Revert 98168, it caused compile errors on mac:

chrome/browser/safe_browsing/browser_features.h

Index: chrome/browser/safe_browsing/browser_features.h
===================================================================
--- chrome/browser/safe_browsing/browser_features.h	(revision 98169)
+++ chrome/browser/safe_browsing/browser_features.h	(working copy)
@@ -1,76 +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.
-//
-// Client-side phishing features that are extracted by the browser, after
-// receiving a score from the renderer.
-
-#ifndef CHROME_BROWSER_SAFE_BROWSING_BROWSER_FEATURES_H_
-#define CHROME_BROWSER_SAFE_BROWSING_BROWSER_FEATURES_H_
-#pragma once
-
-namespace safe_browsing {
-namespace features {
-
-// IMPORTANT: when adding new features, you must update kAllowedFeatures in
-// chrome/browser/safe_browsing/client_side_detection_service.cc if the feature
-// should be sent in sanitized pingbacks.
-//
-////////////////////////////////////////////////////
-// History features.
-////////////////////////////////////////////////////
-
-// Number of visits to that URL stored in the browser history.
-// Should always be an integer larger than 1 because by the time
-// we lookup the history the current URL should already be stored there.
-extern const char kUrlHistoryVisitCount[];
-
-// Number of times the URL was typed in the Omnibox.
-extern const char kUrlHistoryTypedCount[];
-
-// Number of times the URL was reached by clicking a link.
-extern const char kUrlHistoryLinkCount[];
-
-// Number of times URL was visited more than 24h ago.
-extern const char kUrlHistoryVisitCountMoreThan24hAgo[];
-
-// Number of user-visible visits to all URLs on the same host/port as
-// the URL for HTTP and HTTPs.
-extern const char kHttpHostVisitCount[];
-extern const char kHttpsHostVisitCount[];
-
-// Boolean feature which is true if the host was visited for the first
-// time more than 24h ago (only considers user-visible visits like above).
-extern const char kFirstHttpHostVisitMoreThan24hAgo[];
-extern const char kFirstHttpsHostVisitMoreThan24hAgo[];
-
-////////////////////////////////////////////////////
-// Browse features.
-////////////////////////////////////////////////////
-// Note that these features may have the following prefixes appended to them
-// that tell for which page type the feature pertains.
-extern const char kHostPrefix[];
-extern const char kRedirectPrefix[];
-
-// Referrer
-extern const char kReferrer[];
-// True if the referrer was stripped because it is an SSL referrer.
-extern const char kHasSSLReferrer[];
-// Stores the page transition.  See: PageTransition.  We strip the qualifier.
-extern const char kPageTransitionType[];
-// True if this navigation is the first for this tab.
-extern const char kIsFirstNavigation[];
-
-// Resource was fetched from a known bad IP address.
-extern const char kBadIpFetch[];
-
-// SafeBrowsing related featues.  Fields from the UnsafeResource if there is
-// any.
-extern const char kSafeBrowsingMaliciousUrl[];
-extern const char kSafeBrowsingOriginalUrl[];
-extern const char kSafeBrowsingIsSubresource[];
-extern const char kSafeBrowsingThreatType[];
-}  // namespace features
-}  // namespace safe_browsing
-
-#endif  // CHROME_BROWSER_SAFE_BROWSING_BROWSER_FEATURES_H_