[SP] Remove virtual/deferred tests as that code path is near-obsolete.

LayoutTests/VirtualTestSuites

Index: LayoutTests/VirtualTestSuites
diff --git a/LayoutTests/VirtualTestSuites b/LayoutTests/VirtualTestSuites
index 821884af48b8e890be8087b9c7aba7fe40a2c09e..6ba699cad37a6fc093cfd3eb1517ea3b0a0351a7 100644
--- a/LayoutTests/VirtualTestSuites
+++ b/LayoutTests/VirtualTestSuites
@@ -32,20 +32,6 @@
     "args": ["--enable-threaded-compositing"]
   },
   {
-    "prefix": "deferred",
-    "base": "fast/images",
-    "args": ["--enable-deferred-image-decoding",
-             "--enable-per-tile-painting",
-             "--disable-impl-side-painting"]
-  },
-  {
-    "prefix": "deferred",
-    "base": "inspector/tracing",
-    "args": ["--enable-deferred-image-decoding",
-             "--enable-per-tile-painting",
-             "--disable-impl-side-painting"]
-  },
-  {
     "prefix": "prefer_compositing_to_lcd_text",
     "base": "compositing/overflow",
     "args": ["--enable-prefer-compositing-to-lcd-text"]