Removing --disable/enable-threaded-compositing cmdline switches.

third_party/WebKit/LayoutTests/VirtualTestSuites

 [
   {
     "prefix": "color_space",
     "base": "fast/canvas/color-space",
     "args": ["--enable-blink-features=ColorCanvasExtensions"]
   },
   {
     "prefix": "gpu",
     "base": "fast/canvas",
     "args": ["--enable-accelerated-2d-canvas",
              "--disable-display-list-2d-canvas"]
   },
   {
     "prefix": "display_list_2d_canvas",
     "base": "fast/canvas",
     "args": ["--force-display-list-2d-canvas"]
   },
   {
-    "prefix": "threaded",
-    "base": "fast/idleToBlob",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "compositing/visibility",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "fast/compositorworker",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "http/tests/worklet",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "compositing/webgl",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
     "prefix": "prefer_compositing_to_lcd_text",
     "base": "compositing/overflow",
     "args": ["--enable-prefer-compositing-to-lcd-text"]
   },
   {
     "prefix": "prefer_compositing_to_lcd_text",
     "base": "scrollbars",
     "args": ["--enable-prefer-compositing-to-lcd-text"]
   },
   {
     "prefix": "threaded",
     "base": "animations",
-    "args": ["--enable-threaded-compositing",
-             "--disable-composited-antialiasing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "transitions",
-    "args": ["--enable-threaded-compositing"]
+    "args": ["--disable-composited-antialiasing"]
   },
   {
     "prefix": "threaded",
     "base": "fast/scroll-behavior",
-    "args": ["--enable-threaded-compositing",
-             "--enable-prefer-compositing-to-lcd-text"]
+    "args": ["--enable-prefer-compositing-to-lcd-text"]
   },
   {
     "prefix": "gpu-rasterization",
     "base": "images",
     "args": ["--force-gpu-rasterization"]
   },
   {
     "prefix": "exotic-color-space",
     "base": "images",
     "args": ["--force-color-profile=color-spin-gamma24"]
@@ skipping 89 matching lines @@
     "args": ["--enable-features=OffMainThreadFetch"]
   },
   {
     "prefix": "origin-trials-runtimeflags-disabled",
     "base": "http/tests/origin_trials/webexposed",
     "args": ["--disable-blink-features=BudgetQuery,ForeignFetch,InstalledApp,LinkServiceWorker,LongTaskObserver,SetRootScroller,WebUSB,WebVR,WebShare"]
   },
   {
     "prefix": "android",
     "base": "fullscreen",
-    "args": ["--enable-features=OverlayScrollbar", "--enable-threaded-compositing",
+    "args": ["--enable-features=OverlayScrollbar",
              "--enable-fixed-position-compositing", "--enable-prefer-compositing-to-lcd-text",
              "--enable-composited-scrolling-for-frames", "--enable-gesture-tap-highlight", "--enable-pinch",
              "--force-overlay-fullscreen-video", "--enable-overscroll-notifications",
              "--enable-fixed-layout", "--enable-viewport", "--disable-canvas-aa",
              "--disable-composited-antialiasing"]
   },
   {
     "prefix": "media-gpu-accelerated",
     "base": "http/tests/media/media-source",
     "args": ["--use-gpu-in-tests"]
@@ skipping 22 matching lines @@
     "prefix": "without-smil",
     "base": "svg/animations/exposed",
     "args": ["--disable-blink-features=SMIL"]
   },
   {
     "prefix": "linux-subpixel",
     "base": "platform/linux/fast/text/subpixel",
     "args": ["--enable-webkit-text-subpixel-positioning"]
   },
   {
-    "prefix": "threaded",
-    "base": "printing",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
     "prefix": "rootlayerscrolls",
     "base": "scrollingcoordinator",
     "args": ["--root-layer-scrolls"]
   },
   {
     "prefix": "rootlayerscrolls",
     "base": "fast/scrolling",
     "args": ["--root-layer-scrolls"]
   },
   {
@@ skipping 21 matching lines @@
     "base": "fast/events/touch",
     "args": ["--enable-blink-features=ScrollCustomization"]
   },
   {
     "prefix": "mse-1mb-buffers",
     "base": "http/tests/media/media-source/stream_memory_tests",
     "args": ["--mse-audio-buffer-size-limit=1048576",
              "--mse-video-buffer-size-limit=1048576"]
   },
   {
-    "prefix": "threaded",
-    "base": "fast/idle-callback",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
-    "prefix": "threaded",
-    "base": "inspector/tracing",
-    "args": ["--enable-threaded-compositing"]
-  },
-  {
     "prefix": "spv2",
     "base": "compositing",
     "args": ["--enable-slimming-paint-v2"]
   },
   {
     "prefix": "spv2",
     "base": "fast/block",
     "args": ["--enable-slimming-paint-v2"]
   },
   {
@@ skipping 48 matching lines @@
   },
   {
     "prefix": "wheelscrolllatching",
     "base": "fast/events/wheel",
     "args": ["--enable-features=TouchpadAndWheelScrollLatching"]
   },
   {
     "prefix": "wheelscrolllatching",
     "base": "fast/compositor-wheel-scroll-latching",
     "args": ["--enable-features=TouchpadAndWheelScrollLatching",
-             "--enable-threaded-compositing",
              "--disable-smooth-scrolling"]
   },
   {
     "prefix": "mojo-loading",
     "base": "webexposed",
     "args": ["--enable-blink-features=LoadingWithMojo"]
   },
   {
     "prefix": "mojo-loading",
     "base": "http/tests",
@@ skipping 148 matching lines @@
     "prefix": "high-contrast-mode",
     "base": "paint/high-contrast-mode/image-filter-all",
     "args": ["--blink-settings=highContrastMode=3,highContrastImagePolicy=0"]
   },
   {
     "prefix": "high-contrast-mode",
     "base": "paint/high-contrast-mode/image-filter-none",
     "args": ["--blink-settings=highContrastMode=3,highContrastImagePolicy=1"]
   }
 ]