Move about://-related constants from //content to //url

chrome/browser/history/history_backend.cc

 // 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.
 
 #include "chrome/browser/history/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 426 matching lines @@
       // Update the referrer's duration.
       UpdateVisitDuration(from_visit_id, request.time);
     }
   } else {
     // Redirect case. Add the redirect chain.
 
     content::PageTransition redirect_info =
         content::PAGE_TRANSITION_CHAIN_START;
 
     RedirectList redirects = request.redirects;
-    if (redirects[0].SchemeIs(content::kAboutScheme)) {
+    if (redirects[0].SchemeIs(url::kAboutScheme)) {
       // When the redirect source + referrer is "about" we skip it. This
       // happens when a page opens a new frame/window to about:blank and then
       // script sets the URL to somewhere else (used to hide the referrer). It
       // would be nice to keep all these redirects properly but we don't ever
       // see the initial about:blank load, so we don't know where the
       // subsequent client redirect came from.
       //
       // In this case, we just don't bother hooking up the source of the
       // redirects, so we remove it.
       redirects.erase(redirects.begin());
@@ skipping 2390 matching lines @@
   int rank = kPageVisitStatsMaxTopSites;
   std::map<GURL, int>::const_iterator it = most_visited_urls_map_.find(url);
   if (it != most_visited_urls_map_.end())
     rank = (*it).second;
   UMA_HISTOGRAM_ENUMERATION("History.TopSitesVisitsByRank",
                             rank, kPageVisitStatsMaxTopSites + 1);
 }
 #endif
 
 }  // namespace history