Set multi-line attribute on the label before call SizeToFit to avoid DCHECK-ing.

ash/system/chromeos/label_tray_view.cc

Index: ash/system/chromeos/label_tray_view.cc
diff --git a/ash/system/chromeos/label_tray_view.cc b/ash/system/chromeos/label_tray_view.cc
index 8398421d60e63467dc09e995b168dc289b3b6088..5af294efe09271236af9882e08562d3281cfbeb9 100644
--- a/ash/system/chromeos/label_tray_view.cc
+++ b/ash/system/chromeos/label_tray_view.cc
@@ -50,13 +50,14 @@ views::View* LabelTrayView::CreateChildView(
     child->set_border(
         views::Border::CreateEmptyBorder(0, kTrayPopupPaddingHorizontal,
                                          0, kTrayPopupPaddingHorizontal));
+    child->text_label()->SetMultiLine(true);
     child->text_label()->SizeToFit(kTrayNotificationContentsWidth);
   } else {
     child->AddLabel(message, gfx::Font::NORMAL);
+    child->text_label()->SetMultiLine(true);
     child->text_label()->SizeToFit(kTrayNotificationContentsWidth +
                                    kNotificationIconWidth);
   }
-  child->text_label()->SetMultiLine(true);
   child->text_label()->SetAllowCharacterBreak(true);
   child->SetExpandable(true);
   child->SetVisible(true);