Don't treat back/forwards as typed transitions in history.

components/history/core/browser/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 "components/history/core/browser/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 707 matching lines @@
     const GURL& url,
     Time time,
     VisitID referring_visit,
     ui::PageTransition transition,
     VisitSource visit_source) {
   // Top-level frame navigations are visible, everything else is hidden
   bool new_hidden = !ui::PageTransitionIsMainFrame(transition);
 
   // NOTE: This code must stay in sync with
   // ExpireHistoryBackend::ExpireURLsForVisits().
   // TODO(pkasting): http://b/1148304 We shouldn't be marking so many URLs as

[Mark P, 2015/03/24 18:03:01]

Can you clean up this comment too?

   // typed, which would eliminate the need for this code.
   int typed_increment = 0;
   ui::PageTransition transition_type =
       ui::PageTransitionStripQualifier(transition);
   if ((transition_type == ui::PAGE_TRANSITION_TYPED &&
+       ui::PageTransitionIsNewNavigation(transition) &&
        !ui::PageTransitionIsRedirect(transition)) ||
       transition_type == ui::PAGE_TRANSITION_KEYWORD_GENERATED)
     typed_increment = 1;
 
   // See if this URL is already in the DB.
   URLRow url_info(url);
   URLID url_id = db_->GetRowForURL(url, &url_info);
   if (url_id) {
     // Update of an existing row.
     if (ui::PageTransitionStripQualifier(transition) !=
@@ skipping 1917 matching lines @@
   info.url_id = visit.url_id;
   info.time = visit.visit_time;
   info.transition = visit.transition;
   // If we don't have a delegate yet during setup or shutdown, we will drop
   // these notifications.
   if (delegate_)
     delegate_->NotifyAddVisit(info);
 }
 
 }  // namespace history