Make PreviousRootInlineBoxCandidatePosition() to ignore nodes without layout object

third_party/WebKit/Source/core/editing/VisibleUnits.h

Index: third_party/WebKit/Source/core/editing/VisibleUnits.h
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnits.h b/third_party/WebKit/Source/core/editing/VisibleUnits.h
index 77618f7264d228375dbc362c4fca12df683bb2de..15a80992623413b2ffd0139296f5be986625a5da 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnits.h
+++ b/third_party/WebKit/Source/core/editing/VisibleUnits.h
@@ -386,9 +386,10 @@ Position NextRootInlineBoxCandidatePosition(Node*,
                                             const VisiblePosition&,
                                             EditableType);
 
-Position PreviousRootInlineBoxCandidatePosition(Node*,
-                                                const VisiblePosition&,
-                                                EditableType);
+CORE_EXPORT Position
+PreviousRootInlineBoxCandidatePosition(Node*,
+                                       const VisiblePosition&,
+                                       EditableType);
 
 }  // namespace blink