Ensure that data doesn't leak between users on cros chrome crash.

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index 262397a432d451ea1a8dfb08014fd5db5f04d97b..c326751070efb87fbd8da0bc2761312a7ce66a3a 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -130,6 +130,7 @@
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/external_metrics.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/views/browser_dialogs.h"
 #endif
 
@@ -736,6 +737,15 @@ int BrowserMain(const MainFunctionParams& parameters) {
 
   // Try to create/load the profile.
   ProfileManager* profile_manager = browser_process->profile_manager();
+#if defined(OS_CHROMEOS)
+  if (parsed_command_line.HasSwitch(switches::kLoginUser)) {
+    std::string username =
+        parsed_command_line.GetSwitchValueASCII(switches::kLoginUser);
+    LOG(INFO) << "Relaunching browser for user: " << username;
+    chromeos::UserManager::Get()->UserLoggedIn(username);
+  }
+#endif
+
   Profile* profile = profile_manager->GetDefaultProfile(user_data_dir);
 
 #if defined(OS_WIN)