[WebVTT] Rename Middle to Center

third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html

Index: third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html
diff --git a/third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html b/third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html
index ea6a12687793ca6a245e27ea5f6ef68981c20d9c..8d22ab22cddbb9b534ddaaaec96e2f476f86e38e 100644
--- a/third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html
+++ b/third_party/WebKit/LayoutTests/media/track/track-cue-mutable.html
@@ -23,7 +23,7 @@ async_test(function(t) {
         assert_equals(textCue.line, "auto");
         assert_equals(textCue.position, "auto");
         assert_equals(textCue.size, 100);
-        assert_equals(textCue.align, "middle");
+        assert_equals(textCue.align, "center");
 
         // Modify cue values.
         textCue.startTime = 1.1;
@@ -84,9 +84,9 @@ async_test(function(t) {
         // On setting, the text track cue text alignment must be set to the value given in the first cell
         // of the row in the table above whose second cell is a case-sensitive match for the new value.
         textCue.align = "End";
-        assert_equals(textCue.align, "middle");
+        assert_equals(textCue.align, "center");
         textCue.align = "end";
         assert_equals(textCue.align, "end");
     });
 });
-</script>
+</script>