Made launcher hidden when kicking off chrome in app mode.

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index b6ee520f93f1ada04daba5ea04889a7f63ac5579..fe90dd9ce42815214027a9901853f9bf7149ef15 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -36,6 +36,7 @@
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/switch_utils.h"
 #include "chrome/common/time_format.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_service.h"
@@ -584,6 +585,10 @@ double ChromeShellDelegate::GetSavedScreenMagnifierScale() {
 
 ui::MenuModel* ChromeShellDelegate::CreateContextMenu(aura::RootWindow* root) {
   DCHECK(launcher_delegate_);
+  // Don't show context menu for exclusive app runtime mode.
+  if (switches::IsRunningInAppMode())
+    return NULL;
+
   return new LauncherContextMenu(launcher_delegate_, root);
 }