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

Source/modules/screen_orientation/ScreenOrientation.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/screen_orientation/ScreenOrientation.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
@@ skipping 98 matching lines @@
         supplement = new ScreenOrientation(screen);
         provideTo(screen, supplementName(), adoptPtrWillBeNoop(supplement));
     }
     return *supplement;
 }
 
 ScreenOrientation::~ScreenOrientation()
 {
 }
 
-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)
 {
     RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(state);
     ScriptPromise promise = resolver->promise();
 
     ScreenOrientation& screenOrientation = ScreenOrientation::from(screen);
     Document* document = screenOrientation.document();
 
@@ skipping 16 matching lines @@
 void ScreenOrientation::unlockOrientation(Screen& screen)
 {
     ScreenOrientation& screenOrientation = ScreenOrientation::from(screen);
     if (!screenOrientation.frame())
         return;
 
     ScreenOrientationController::from(*screenOrientation.frame()).unlockOrientation();
 }
 
 } // namespace WebCore