Fix assertions related to floats and z-order lists when compositing opaque scrollers

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
index 5fbf5297154be2d5a76a7906402f87f0535bce1a..7cb1f5acfbda3468de0669a3f09ab65a229330c8 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
@@ -3359,13 +3359,10 @@ void LayoutBlockFlow::setAncestorShouldPaintFloatingObject(const LayoutBox& floa
                 floatingObject.setShouldPaint(true);
                 return;
             }
-        } else if (floatingObject.shouldPaint()) {
+        } else {
             floatingObject.setShouldPaint(false);
-            return;
         }
     }
-    // We should have found the ancestor to update shouldPaint flag.
-    ASSERT_NOT_REACHED();
 }
 
 bool LayoutBlockFlow::allowsPaginationStrut() const