Don't force layout of descendants of SVG containers needing self-layout

third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp

Index: third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp b/third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp
index b5681822dd7a04521e2faf5719d1af9a1c0e5771..a67e8ed8d2c0614de0ba8d3b01a9dec99d3ab203 100644
--- a/third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.cpp
@@ -261,13 +261,15 @@ bool SVGLayoutSupport::layoutSizeOfNearestViewportChanged(const LayoutObject* st
 
 bool SVGLayoutSupport::screenScaleFactorChanged(const LayoutObject* ancestor)
 {
-    while (ancestor && !ancestor->isSVGRoot()) {
+    for (; ancestor; ancestor = ancestor->parent()) {
+        if (ancestor->isSVGRoot())
+            return toLayoutSVGRoot(ancestor)->didScreenScaleFactorChange();
         if (ancestor->isSVGTransformableContainer())
             return toLayoutSVGTransformableContainer(ancestor)->didScreenScaleFactorChange();
         if (ancestor->isSVGViewportContainer())
             return toLayoutSVGViewportContainer(ancestor)->didScreenScaleFactorChange();
-        ancestor = ancestor->parent();
     }
+    ASSERT_NOT_REACHED();
     return false;
 }