Revert of [screen-orientation] Update implementation to match recent spec changes.

Source/core/frame/LocalFrame.cpp

Index: Source/core/frame/LocalFrame.cpp
diff --git a/Source/core/frame/LocalFrame.cpp b/Source/core/frame/LocalFrame.cpp
index 7d801447ee086cc95ec36cf16c02b687e1f3008b..366b8f016ab3270992d0c20a59aa0c703e6113e9 100644
--- a/Source/core/frame/LocalFrame.cpp
+++ b/Source/core/frame/LocalFrame.cpp
@@ -159,6 +159,30 @@
     }
 }
 
+void LocalFrame::sendOrientationChangeEvent()
+{
+    if (!RuntimeEnabledFeatures::orientationEventEnabled() && !RuntimeEnabledFeatures::screenOrientationEnabled())
+        return;
+
+    if (page()->visibilityState() != PageVisibilityStateVisible)
+        return;
+
+    LocalDOMWindow* window = domWindow();
+    if (!window)
+        return;
+    window->dispatchEvent(Event::create(EventTypeNames::orientationchange));
+
+    // Notify subframes.
+    Vector<RefPtr<LocalFrame> > childFrames;
+    for (Frame* child = tree().firstChild(); child; child = child->tree().nextSibling()) {
+        if (child->isLocalFrame())
+            childFrames.append(toLocalFrame(child));
+    }
+
+    for (size_t i = 0; i < childFrames.size(); ++i)
+        childFrames[i]->sendOrientationChangeEvent();
+}
+
 void LocalFrame::setPrinting(bool printing, const FloatSize& pageSize, const FloatSize& originalPageSize, float maximumShrinkRatio)
 {
     // In setting printing, we should not validate resources already cached for the document.