Merge virtual mac-antialiasedtext and windows-directwrite test suites

LayoutTests/platform/win-xp/virtual/windows-directwrite/fast/text/bidi-img-alt-text-expected.txt

Index: LayoutTests/platform/win-xp/virtual/windows-directwrite/fast/text/bidi-img-alt-text-expected.txt
diff --git a/LayoutTests/platform/win-xp/virtual/windows-directwrite/fast/text/bidi-img-alt-text-expected.txt b/LayoutTests/platform/win-xp/virtual/windows-directwrite/fast/text/bidi-img-alt-text-expected.txt
deleted file mode 100644
index 375997cd0c925b767ec9b2f47c0dd7d396f2224e..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win-xp/virtual/windows-directwrite/fast/text/bidi-img-alt-text-expected.txt
+++ /dev/null
@@ -1,77 +0,0 @@
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