Tighten the asserts in VTTCue::calculateDisplayParameters()

Source/core/html/track/vtt/VTTCue.cpp

Index: Source/core/html/track/vtt/VTTCue.cpp
diff --git a/Source/core/html/track/vtt/VTTCue.cpp b/Source/core/html/track/vtt/VTTCue.cpp
index 83eb98e01169ad78ed13b1dbe813f83e30eecaf8..63dbe67117c8e876b2f16ea6cbd2897d82038348 100644
--- a/Source/core/html/track/vtt/VTTCue.cpp
+++ b/Source/core/html/track/vtt/VTTCue.cpp
@@ -626,7 +626,7 @@ void VTTCue::calculateDisplayParameters()
             else
                 m_displayPosition.first = 100 - m_textPosition - m_displaySize / 2;
             break;
-        case NumberOfAlignments:
+        default:
             ASSERT_NOT_REACHED();
         }
     } else {
@@ -643,7 +643,7 @@ void VTTCue::calculateDisplayParameters()
         case Middle:
             m_displayPosition.second = m_textPosition - m_displaySize / 2;
             break;
-        case NumberOfAlignments:
+        default:
             ASSERT_NOT_REACHED();
         }
     }