Remove hidden elements from MHTML

third_party/WebKit/Source/core/frame/FrameSerializer.h

Index: third_party/WebKit/Source/core/frame/FrameSerializer.h
diff --git a/third_party/WebKit/Source/core/frame/FrameSerializer.h b/third_party/WebKit/Source/core/frame/FrameSerializer.h
index 856863fd3bbd6ee9b5008477fedd30417b4889ac..61540f9bee682ec128110352c57a05686863709f 100644
--- a/third_party/WebKit/Source/core/frame/FrameSerializer.h
+++ b/third_party/WebKit/Source/core/frame/FrameSerializer.h
@@ -67,6 +67,9 @@ class CORE_EXPORT FrameSerializer final {
  public:
   class Delegate {
    public:
+    // Controls whether HTML serialization should skip the given element.
+    virtual bool shouldIgnoreElement(const Element&) { return false; }
+
     // Controls whether HTML serialization should skip the given attribute.
     virtual bool shouldIgnoreAttribute(const Element&, const Attribute&) {
       return false;