Remove all writing mode function arguments and remove writing mode from RenderStyle.

sky/engine/platform/text/WritingMode.h

Index: sky/engine/platform/text/WritingMode.h
diff --git a/sky/engine/platform/text/WritingMode.h b/sky/engine/platform/text/WritingMode.h
index 90716904cc152c55309a2c97da7965cd52801ff7..d607dac97eda6826fd8794c09f62492acb3d7c15 100644
--- a/sky/engine/platform/text/WritingMode.h
+++ b/sky/engine/platform/text/WritingMode.h
@@ -39,21 +39,21 @@ enum WritingMode {
 };
 
 // Lines have horizontal orientation; modes horizontal-tb or horizontal-bt.
-inline bool isHorizontalWritingMode(WritingMode writingMode)
+inline bool isHorizontalWritingMode()
 {
     // FIXME(sky): Remove
     return true;
 }
 
 // Bottom of the line occurs earlier in the block; modes vertical-lr or horizontal-bt.
-inline bool isFlippedLinesWritingMode(WritingMode writingMode)
+inline bool isFlippedLinesWritingMode()
 {
     // FIXME(sky): Remove
     return false;
 }
 
 // Block progression increases in the opposite direction to normal; modes vertical-rl or horizontal-bt.
-inline bool isFlippedBlocksWritingMode(WritingMode writingMode)
+inline bool isFlippedBlocksWritingMode()
 {
     // FIXME(sky): Remove
     return false;