Change logging of about:flags from actions to a histogram.

chrome/browser/chromeos/login/session/user_session_manager.cc

 // Copyright 2014 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/chromeos/login/session/user_session_manager.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <string>
@@ skipping 702 matching lines @@
   if (user_manager::UserManager::Get()->GetLoggedInUsers().size() > 1)
     return false;
 
   const base::CommandLine user_flags(CreatePerSessionCommandLine(profile));
   std::set<base::CommandLine::StringType> command_line_difference;
   if (!NeedRestartToApplyPerSessionFlags(user_flags, &command_line_difference))
     return false;
 
   LogCustomSwitches(command_line_difference);
 
-  about_flags::ReportCustomFlags("Login.CustomFlags", command_line_difference);
+  about_flags::ReportAboutFlagsHistogram("Login.CustomFlags",
+                                         command_line_difference);
 
   base::CommandLine::StringVector flags;
   // argv[0] is the program name |base::CommandLine::NO_PROGRAM|.
   flags.assign(user_flags.argv().begin() + 1, user_flags.argv().end());
   LOG(WARNING) << "Restarting to apply per-session flags...";
   DBusThreadManager::Get()->GetSessionManagerClient()->SetFlagsForUser(
       cryptohome::Identification(
           user_manager::UserManager::Get()->GetActiveUser()->GetAccountId()),
       flags);
   AttemptRestart(profile);
@@ skipping 1160 matching lines @@
           ->browser_policy_connector_chromeos()
           ->IsEnterpriseManaged()) {
     return false;
   }
 
   // Do not show end of life notification if this is a guest session
   return !profile->IsGuestSession();
 }
 
 }  // namespace chromeos