Coalesce more hardcoded schemes to using predefined constants.

chrome/browser/history/history_backend.cc

 // Copyright (c) 2006-2008 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 <set>
 
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "chrome/browser/autocomplete/history_url_provider.h"
 #include "chrome/browser/bookmarks/bookmark_service.h"
 #include "chrome/browser/history/download_types.h"
 #include "chrome/browser/history/history_publisher.h"
 #include "chrome/browser/history/in_memory_history_backend.h"
 #include "chrome/browser/history/page_usage_data.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/common/sqlite_utils.h"
+#include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/registry_controlled_domain.h"
 
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
 
 /* The HistoryBackend consists of a number of components:
 
     HistoryDatabase (stores past 3 months of history)
@@ skipping 326 matching lines @@
     // Update the segment for this visit.
     UpdateSegments(request->url, from_visit_id, last_ids.second, t,
                    last_recorded_time_);
   } else {
     // Redirect case. Add the redirect chain.
     PageTransition::Type transition =
         PageTransition::StripQualifier(request->transition);
 
     PageTransition::Type redirect_info = PageTransition::CHAIN_START;
 
-    if (request->redirects[0].SchemeIs("about")) {
+    if (request->redirects[0].SchemeIs(chrome::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.
       request->redirects.erase(request->redirects.begin());
@@ skipping 1442 matching lines @@
   return true;
 }
 
 BookmarkService* HistoryBackend::GetBookmarkService() {
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history