Flip flag to turn CrOS Browser Compositor Single Threaded

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index a837e9b4a5f5df84819874fcf2f1c0131c556144..c7e14c069b00f4df3a8d7bf3076292d5a02850a4 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -74,17 +74,6 @@ InProcessContextFactory::InProcessContextFactory(
   DCHECK_NE(gfx::GetGLImplementation(), gfx::kGLImplementationNone)
       << "If running tests, ensure that main() is calling "
       << "gfx::GLSurface::InitializeOneOffForTests()";
-
-#if defined(OS_CHROMEOS)
-  bool use_thread = !base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kUIDisableThreadedCompositing);
-#else
-  bool use_thread = false;
-#endif
-  if (use_thread) {
-    compositor_thread_.reset(new base::Thread("Browser Compositor"));
-    compositor_thread_->Start();
-  }
 }
 
 InProcessContextFactory::~InProcessContextFactory() {