Merge virtual mac-antialiasedtext and windows-directwrite test suites

LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-negative-spacing-features-expected.txt

Index: LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-negative-spacing-features-expected.txt
diff --git a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-negative-spacing-features-expected.txt b/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-negative-spacing-features-expected.txt
deleted file mode 100644
index bb227a996e85326db224349925b411aeaae65a71..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/virtual/mac-antialiasedtext/fast/text/atsui-negative-spacing-features-expected.txt
+++ /dev/null
@@ -1,52 +0,0 @@
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