Added "--login-user=" option for the Guest session.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 66c99a2a06206f443c04e0aa9a76f49c483ecd12..7e030db54fc323e08e504d5c94914cdd2813827d 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1308,10 +1308,8 @@ void Browser::OpenCurrentURL() {
       TabStripModel::ADD_FORCE_INDEX | TabStripModel::ADD_INHERIT_OPENER;
   browser::Navigate(&params);
 
-  // TODO: the ExtensionService should never be NULL, but in some cases it is,
-  // see bug 73768. After it is resolved, the explicit test can go away.
-  ExtensionService* service = profile_->GetExtensionService();
-  if (service && service->IsInstalledApp(url)) {
+  DCHECK(profile_->GetExtensionService());
+  if (profile_->GetExtensionService()->IsInstalledApp(url)) {
     UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppLaunchHistogram,
                               extension_misc::APP_LAUNCH_OMNIBOX_LOCATION,
                               extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
@@ -3517,10 +3515,8 @@ void Browser::CommitInstant(TabContentsWrapper* preview_contents) {
   instant_unload_handler_->RunUnloadListenersOrDestroy(old_contents, index);
 
   GURL url = preview_contents->tab_contents()->GetURL();
-  // TODO: the ExtensionService should never be NULL, but in some cases it is,
-  // see bug 73768. After it is resolved, the explicit test can go away.
-  ExtensionService* service = profile_->GetExtensionService();
-  if (service && service->IsInstalledApp(url)) {
+  DCHECK(profile_->GetExtensionService());
+  if (profile_->GetExtensionService()->IsInstalledApp(url)) {
     UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppLaunchHistogram,
                               extension_misc::APP_LAUNCH_OMNIBOX_INSTANT,
                               extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);