Revert of [screen-orientation] Expose orientation info in OrientationInformation interface.

Source/modules/screen_orientation/ScreenOrientation.cpp

Index: Source/modules/screen_orientation/ScreenOrientation.cpp
diff --git a/Source/modules/screen_orientation/ScreenOrientation.cpp b/Source/modules/screen_orientation/ScreenOrientation.cpp
index 356344e4c36176ca4a1413c3dfd667ac09ea4f7b..8114c51173ea3ec852d08703d41b2dfd5692afb9 100644
--- a/Source/modules/screen_orientation/ScreenOrientation.cpp
+++ b/Source/modules/screen_orientation/ScreenOrientation.cpp
@@ -116,13 +116,15 @@
 {
 }
 
-OrientationInformation* ScreenOrientation::orientation(Screen& screen)
+const AtomicString& ScreenOrientation::orientation(Screen& screen)
 {
     ScreenOrientation& screenOrientation = ScreenOrientation::from(screen);
     if (!screenOrientation.frame()) {
-        return 0;
+        // FIXME: we should try to return a better guess, like the latest known value.
+        return orientationTypeToString(blink::WebScreenOrientationPortraitPrimary);
     }
-    return ScreenOrientationController::from(*screenOrientation.frame()).orientation();
+    ScreenOrientationController& controller = ScreenOrientationController::from(*screenOrientation.frame());
+    return orientationTypeToString(controller.orientation());
 }
 
 ScriptPromise ScreenOrientation::lockOrientation(ScriptState* state, Screen& screen, const AtomicString& lockString)