Rename last two virtual test suites to complete VirtualTestSuite refactoring.

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

Index: LayoutTests/platform/linux/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
diff --git a/LayoutTests/platform/linux/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt b/LayoutTests/platform/linux/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
deleted file mode 100644
index ba3e3d87da593c38936e09584cd4ec087f3aaa9e..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/virtual/gpu/compositedscrolling/scrollbars/custom-scrollbar-with-incomplete-style-expected.txt
+++ /dev/null
@@ -1,31 +0,0 @@
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