Don't let current width affect preferred width on shrink-to-fit containers

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index b3ce79001e2e92b024d7d6e9b4bfe4cf2ec640df..baa0124156744affbf73bdc56f8175ce80436a25 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -2750,9 +2750,14 @@ LayoutUnit LayoutBox::ComputeLogicalWidthUsing(
                                                  ToLayoutBlockFlow(cb)));
 
   if (width_type == kMainOrPreferredSize &&
-      SizesLogicalWidthToFitContent(logical_width))
+      SizesLogicalWidthToFitContent(logical_width)) {
+    // Reset width so that any percent margins on inline children do not
+    // use it when calculating min/max preferred width.
+    // TODO(crbug.com/710026): Remove const_cast
+    const_cast<LayoutBox*>(this)->SetLogicalWidth(LayoutUnit());
     return std::max(MinPreferredLogicalWidth(),
                     std::min(MaxPreferredLogicalWidth(), logical_width_result));
+  }
   return logical_width_result;
 }