ChromeOs: Call BrowserList::SessionEnding when shutting down via SIGTERM

chrome/browser/browser_main_posix.cc

 // Copyright (c) 2011 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/browser_main_posix.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <signal.h>
 #include <sys/resource.h>
@@ skipping 117 matching lines @@
       break;
     } else if (ret == 0) {
       NOTREACHED() << "Unexpected closure of shutdown pipe.";
       ShutdownFDClosedError();
       break;
     }
     bytes_read += ret;
   } while (bytes_read < sizeof(signal));
   VLOG(1) << "Handling shutdown for signal " << signal << ".";
 #if defined(OS_CHROMEOS)
-  // On ChromeOS, exiting on signal should be always clean.
-  Task* task = NewRunnableFunction(BrowserList::ExitCleanly);
+  // On ChromeOS, exiting on signal means END_SESSION.
+  Task* task = NewRunnableFunction(BrowserList::SessionEnding);
 #else
   Task* task = NewRunnableFunction(BrowserList::AttemptExit);
 #endif
 
   if (!BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, task)) {
     // Without a UI thread to post the exit task to, there aren't many
     // options.  Raise the signal again.  The default handler will pick it up
     // and cause an ungraceful exit.
     RAW_LOG(WARNING, "No UI thread, exiting ungracefully.");
     kill(getpid(), signal);
@@ skipping 106 matching lines @@
             new ShutdownDetector(g_shutdown_pipe_read_fd))) {
       LOG(DFATAL) << "Failed to create shutdown detector task.";
     }
   }
 
 #if defined(TOOLKIT_USES_GTK) && !defined(OS_CHROMEOS)
   printing::PrintingContextCairo::SetCreatePrintDialogFunction(
       &PrintDialogGtk::CreatePrintDialog);
 #endif
 }