Removes usage of Compositor/ContextFactory methods

ui/compositor/test/context_factories_for_test.cc

Index: ui/compositor/test/context_factories_for_test.cc
diff --git a/ui/compositor/test/context_factories_for_test.cc b/ui/compositor/test/context_factories_for_test.cc
index dbee78cf4e98e8b213f2303a40ec8e3693f657ad..f3eeeb369a39085c9ae8fb932c2e150399ca3ef8 100644
--- a/ui/compositor/test/context_factories_for_test.cc
+++ b/ui/compositor/test/context_factories_for_test.cc
@@ -30,12 +30,10 @@ ui::ContextFactory* InitializeContextFactoryForTests(bool enable_pixel_output) {
   if (enable_pixel_output)
     g_disable_null_draw = new gfx::DisableNullDrawGLBindings;
   g_implicit_factory = new InProcessContextFactory();
-  ContextFactory::SetInstance(g_implicit_factory);
   return g_implicit_factory;
 }
 
 void TerminateContextFactoryForTests() {
-  ContextFactory::SetInstance(NULL);
   delete g_implicit_factory;
   g_implicit_factory = NULL;
   delete g_disable_null_draw;