Remove the "horizontal-bt" value from -webkit-writing-mode

third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html

Index: third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html
diff --git a/third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html b/third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html
index 1d1d9257765cbf0c37507d8d536b09bf4b3bc2bb..3cb021249e510a4c6a53779fe99b941edc241e5e 100644
--- a/third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html
+++ b/third_party/WebKit/LayoutTests/css3/flexbox/multiline-align-content-horizontal-column.html
@@ -20,9 +20,6 @@
 .horizontal-tb {
     -webkit-writing-mode: horizontal-tb;
 }
-.horizontal-bt {
-    -webkit-writing-mode: horizontal-bt;
-}
 .column {
     flex-flow: column;
 }
@@ -144,85 +141,6 @@ var expectations = {
             },
         },
     },
-    'horizontal-bt': {
-        // Same as horizontal-tb.
-        'column': {
-            'ltr': {
-                'wrap': {
-                    'flex-start': [0, 100],
-                    'flex-end': [400, 500],
-                    'center': [200, 300],
-                    'space-between': [0, 500],
-                    'space-around': [100, 400],
-                    'stretch': [0, 300],
-                },
-                'wrap-reverse': {
-                    'flex-start': [500, 400],
-                    'flex-end': [100, 0],
-                    'center': [300, 200],
-                    'space-between': [500, 0],
-                    'space-around': [400, 100],
-                    'stretch': [300, 0],
-                },
-            },
-            'rtl': {
-                'wrap': {
-                    'flex-start': [500, 400],
-                    'flex-end': [100, 0],
-                    'center': [300, 200],
-                    'space-between': [500, 0],
-                    'space-around': [400, 100],
-                    'stretch': [300, 0],
-                },
-                'wrap-reverse': {
-                    'flex-start': [0, 100],
-                    'flex-end': [400, 500],
-                    'center': [200, 300],
-                    'space-between': [0, 500],
-                    'space-around': [100, 400],
-                    'stretch': [0, 300],
-                },
-            },
-        },
-        'column-reverse': {
-            'ltr': {
-                'wrap': {
-                    'flex-start': [0, 100],
-                    'flex-end': [400, 500],
-                    'center': [200, 300],
-                    'space-between': [0, 500],
-                    'space-around': [100, 400],
-                    'stretch': [0, 300],
-                },
-                'wrap-reverse': {
-                    'flex-start': [500, 400],
-                    'flex-end': [100, 0],
-                    'center': [300, 200],
-                    'space-between': [500, 0],
-                    'space-around': [400, 100],
-                    'stretch': [300, 0],
-                },
-            },
-            'rtl': {
-                'wrap': {
-                    'flex-start': [500, 400],
-                    'flex-end': [100, 0],
-                    'center': [300, 200],
-                    'space-between': [500, 0],
-                    'space-around': [400, 100],
-                    'stretch': [300, 0],
-                },
-                'wrap-reverse': {
-                    'flex-start': [0, 100],
-                    'flex-end': [400, 500],
-                    'center': [200, 300],
-                    'space-between': [0, 500],
-                    'space-around': [100, 400],
-                    'stretch': [0, 300],
-                },
-            },
-        },
-    },
 };
 
 function mainAxisDirection(writingMode, flexDirection)
@@ -247,7 +165,7 @@ function addChild(flexbox, preferredSize, alignContent, expected_x_offset)
     flexbox.appendChild(child);
 }
 
-var writingModes = ['horizontal-tb', 'horizontal-bt'];
+var writingModes = ['horizontal-tb'];
 var flexDirections = ['column', 'column-reverse'];
 var directions = ['ltr', 'rtl'];
 var wraps = ['wrap', 'wrap-reverse'];