Stop trusting the sign-in process if it manages to navigate to another URL.

chrome/browser/signin/signin_manager.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/signin/signin_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 85 matching lines @@
       "Replacing in-use signin process.";
   signin_process_id_ = process_id;
   const content::RenderProcessHost* process =
       content::RenderProcessHost::FromID(process_id);
   DCHECK(process);
   registrar_.Add(this,
                  content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
                  content::Source<content::RenderProcessHost>(process));
 }
 
+void SigninManager::ClearSigninProcess() {
+  signin_process_id_ = kInvalidProcessId;
+}
+
 bool SigninManager::IsSigninProcess(int process_id) const {
   return process_id == signin_process_id_;
 }
 
 bool SigninManager::HasSigninProcess() const {
   return signin_process_id_ != kInvalidProcessId;
 }
 
 SigninManager::~SigninManager() {
 }
@@ skipping 581 matching lines @@
   }
 }
 
 void SigninManager::ProhibitSignout(bool prohibit_signout) {
   prohibit_signout_ = prohibit_signout;
 }
 
 bool SigninManager::IsSignoutProhibited() const {
   return prohibit_signout_;
 }