Fix crash when locking a profile.

chrome/browser/profiles/profile_window.cc

Index: chrome/browser/profiles/profile_window.cc
diff --git a/chrome/browser/profiles/profile_window.cc b/chrome/browser/profiles/profile_window.cc
index d65dd17e1133816c98580c2a60ffc166435cb512..5070130d3963edd52ffa6e47668928bd14f4544e 100644
--- a/chrome/browser/profiles/profile_window.cc
+++ b/chrome/browser/profiles/profile_window.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/user_metrics.h"
 
@@ -176,4 +177,15 @@ void CloseGuestProfileWindows() {
   }
 }
 
+void LockProfile(Profile* profile) {
+  DCHECK(profile);
+  ProfileInfoCache& cache =
+      g_browser_process->profile_manager()->GetProfileInfoCache();
+
+  size_t index = cache.GetIndexOfProfileWithPath(profile->GetPath());
+  cache.SetProfileSigninRequiredAtIndex(index, true);
+  chrome::ShowUserManager(profile->GetPath());
+  BrowserList::CloseAllBrowsersWithProfile(profile);
+}
+
 }  // namespace profiles