Rename last two virtual test suites to complete VirtualTestSuite refactoring.

LayoutTests/platform/win/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt

Index: LayoutTests/platform/win/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
diff --git a/LayoutTests/platform/win/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt b/LayoutTests/platform/win/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
deleted file mode 100644
index c57b874de8bf7e22c335241c538b1d5af9bcd7ae..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
+++ /dev/null
@@ -1,31 +0,0 @@
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