Remove EnableThreadedCompositing from the browser.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index c629485f9059f0cd40fdcc431afc5543dfdf0eae..adbd0c547c6849c266f7a2e28a267db14cf50c34 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1016,9 +1016,6 @@ static void AppendCompositorCommandLineFlags(CommandLine* command_line) {
   if (IsPinchVirtualViewportEnabled())
     command_line->AppendSwitch(cc::switches::kEnablePinchVirtualViewport);
 
-  if (IsThreadedCompositingEnabled())
-    command_line->AppendSwitch(switches::kEnableThreadedCompositing);
-
   if (IsDelegatedRendererEnabled())
     command_line->AppendSwitch(switches::kEnableDelegatedRenderer);
 
@@ -1120,6 +1117,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kDisableSeccompFilterSandbox,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
+    switches::kDisableThreadedCompositing,
     switches::kDisableTouchAdjustment,
     switches::kDisableTouchDragDrop,
     switches::kDisableTouchEditing,
@@ -1161,11 +1159,11 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kEnableStatsTable,
     switches::kEnableStrictSiteIsolation,
     switches::kEnableTargetedStyleRecalc,
+    switches::kEnableThreadedCompositing,
     switches::kEnableTouchDragDrop,
     switches::kEnableTouchEditing,
     switches::kEnableViewport,
     switches::kEnableViewportMeta,
-    switches::kMainFrameResizesAreOrientationChanges,
     switches::kEnableVtune,
     switches::kEnableWebAnimationsSVG,
     switches::kEnableWebGLDraftExtensions,
@@ -1178,6 +1176,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kIPCConnectionTimeout,
     switches::kJavaScriptFlags,
     switches::kLoggingLevel,
+    switches::kMainFrameResizesAreOrientationChanges,
     switches::kMaxUntiledLayerWidth,
     switches::kMaxUntiledLayerHeight,
     switches::kMemoryMetrics,