Revert of Moves ash content specific tests into ash_content_unittests

ash/content/display/screen_orientation_controller_chromeos_unittest.cc

Index: ash/content/display/screen_orientation_controller_chromeos_unittest.cc
diff --git a/ash/content/display/screen_orientation_controller_chromeos_unittest.cc b/ash/content/display/screen_orientation_controller_chromeos_unittest.cc
index 2802067b01ebdda81b7e48f74cec0a4aab013e6e..77171fa4fc8432f4c6a02727a286031d61ca902e 100644
--- a/ash/content/display/screen_orientation_controller_chromeos_unittest.cc
+++ b/ash/content/display/screen_orientation_controller_chromeos_unittest.cc
@@ -14,7 +14,6 @@
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
-#include "ash/test/ash_test_environment_content.h"
 #include "ash/test/ash_test_helper.h"
 #include "ash/test/content/test_shell_content_state.h"
 #include "ash/test/display_manager_test_api.h"
@@ -109,10 +108,8 @@
   ~ScreenOrientationControllerTest() override;
 
   content::ScreenOrientationDelegate* delegate() {
-    test::AshTestEnvironmentContent* test_environment_content =
-        static_cast<test::AshTestEnvironmentContent*>(
-            ash_test_helper()->ash_test_environment());
-    return test_environment_content->test_shell_content_state()
+    return ash_test_helper()
+        ->test_shell_content_state()
         ->screen_orientation_delegate();
   }