Fix crash for the toast

Toast flavors 0 and 1 are affected because we dereference a null pointer

BUG=129499
TEST=see bug
TBR=sky@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10836298

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151990 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/first_run/try_chrome_dialog_view.cc

@@ -335,8 +335,10 @@ void TryChromeDialogView::ButtonPressed(views::Button* sender,
       NOTREACHED() << "Unknown radio button selected";
   }
 
-  if ((result_ == TRY_CHROME) && make_default_->checked())
-      result_ = TRY_CHROME_AS_DEFAULT;
+  if (make_default_) {
+    if ((result_ == TRY_CHROME) && make_default_->checked())
+        result_ = TRY_CHROME_AS_DEFAULT;
+  }
 
   popup_->Close();
   MessageLoop::current()->Quit();