Add garbage collection for shared extensions on Chrome OS

chrome/browser/chromeos/login/users/fake_user_manager.cc

Index: chrome/browser/chromeos/login/users/fake_user_manager.cc
diff --git a/chrome/browser/chromeos/login/users/fake_user_manager.cc b/chrome/browser/chromeos/login/users/fake_user_manager.cc
index 9655c204eac47205b11aa37a070e6911b9737740..f3427b39e79b2b45c1a3f3eda65bbd49e9fade42 100644
--- a/chrome/browser/chromeos/login/users/fake_user_manager.cc
+++ b/chrome/browser/chromeos/login/users/fake_user_manager.cc
@@ -153,6 +153,11 @@ bool FakeUserManager::IsKnownUser(const std::string& email) const {
 }
 
 const User* FakeUserManager::FindUser(const std::string& email) const {
+  const UserList& users = GetUsers();
+  for (UserList::const_iterator it = users.begin(); it != users.end(); ++it) {
+    if ((*it)->email() == email)
+      return *it;
+  }
   return NULL;
 }