AppCaches which belong to hosted apps are not protected from deletion

chrome/browser/profiles/profile_manager.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 <set>
 
 #include "chrome/browser/profiles/profile_manager.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/sessions/session_service_factory.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 543 matching lines @@
 }
 
 // static
 bool ProfileManager::IsMultipleProfilesEnabled() {
 #if defined(TOOLKIT_VIEWS) && !defined(OS_CHROMEOS)
   return true;
 #else
   return CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles);
 #endif
 }
+
+void ProfileManager::ClearAppCaches() {
+  // The WaitableEvent returned by Profile::ClearAppCache() is alive as long as
+  // the Profile is alive. In the future, the Profiles will be deleted earlier
+  // than currently (see
+  // http://code.google.com/p/chromium/issues/detail?id=88586 ). In that case,
+  // Profile::ClearAppCache() must be called when the deletion of the Profile is
+  // initiated, and the Profile can only be deleted after it has finished. A
+  // WaitableEventWatcher can be used for detecting when it has finished.
+  std::map<FilePath, linked_ptr<ProfileInfo> >::iterator it;
+  for (it = profiles_info_.begin(); it != profiles_info_.end(); ++it) {
+    base::WaitableEvent* event = it->second->profile->ClearAppCache();
+    if (event)
+      event->Wait();
+  }
+}