Move test-only ContextFactory implementations out of production targets

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index b7a4823d936dac2aaeeae36958595a363dd2c013..7676e422ec194f0ab5b34404b03377cc79e75032 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -23,7 +23,6 @@
 #include "base/logging.h"
 #include "content/public/test/test_browser_context.h"
 #include "ui/aura/window.h"
-#include "ui/compositor/compositor.h"
 
 namespace ash {
 namespace test {
@@ -142,10 +141,6 @@ ui::MenuModel* TestShellDelegate::CreateContextMenu(aura::Window* root) {
 }
 
 RootWindowHostFactory* TestShellDelegate::CreateRootWindowHostFactory() {
-  // The ContextFactory must exist before any Compositors are created.
-  bool allow_test_contexts = true;
-  ui::Compositor::InitializeContextFactoryForTests(allow_test_contexts);
-
   return RootWindowHostFactory::Create();
 }