Don't install external extensions in tests

chrome/browser/extensions/default_apps.cc

Index: chrome/browser/extensions/default_apps.cc
diff --git a/chrome/browser/extensions/default_apps.cc b/chrome/browser/extensions/default_apps.cc
index d692c9c639dd64cd10b3bfabedfcda9141c0292f..3583416cf381dbe818478594d9d256cb4b1021b3 100644
--- a/chrome/browser/extensions/default_apps.cc
+++ b/chrome/browser/extensions/default_apps.cc
@@ -114,11 +114,6 @@ bool Provider::ShouldInstallInProfile() {
   if (install_apps && !IsLocaleSupported())
     install_apps = false;
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableDefaultApps)) {
-    install_apps = false;
-  }
-
   // Default apps are only installed on profile creation or a new chrome
   // download.
   if (state == kUnknown) {