Fixed-position elements should not be clipped by ancestor fixed-position overflow clip

third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
index c823e20b596812da42f09521694149aecc0a71ba..21452394cd97688b1adb81f32912238736aa6c97 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
@@ -36,13 +36,6 @@ static const PaintLayer* findParentLayerOnClippingContainerChain(const PaintLaye
     while (current) {
         if (current->style()->position() == FixedPosition) {
             for (current = current->parent(); current && !current->canContainFixedPositionObjects(); current = current->parent()) {
-                // All types of clips apply to fixed-position descendants of other fixed-position elements.
-                // Note: it's unclear whether this is what the spec says. Firefox does not clip, but Chrome does.
-                if (current->style()->position() == FixedPosition && current->hasClipRelatedProperty()) {
-                    ASSERT(current->hasLayer());
-                    return static_cast<const LayoutBoxModelObject*>(current)->layer();
-                }
-
                 // CSS clip applies to fixed position elements even for ancestors that are not what the
                 // fixed element is positioned with respect to.
                 if (current->hasClip()) {