AppCaches which belong to hosted apps are not protected from deletion

chrome/browser/profiles/profile_manager.cc

Index: chrome/browser/profiles/profile_manager.cc
diff --git a/chrome/browser/profiles/profile_manager.cc b/chrome/browser/profiles/profile_manager.cc
index ab966c96752f7955680d58fbb5ea769565a1b999..015fcaaa7cffd802c15d45fd70ed1d2e612d5b58 100644
--- a/chrome/browser/profiles/profile_manager.cc
+++ b/chrome/browser/profiles/profile_manager.cc
@@ -12,6 +12,7 @@
 #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"
@@ -575,3 +576,19 @@ bool ProfileManager::IsMultipleProfilesEnabled() {
   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();
+  }
+}