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 42d2681c4c9264275881200d5566029f36e39809..6758ab3ac47173922604e7f22de129d71932c7f2 100644
--- a/third_party/WebKit/Source/core/frame/FrameSerializer.h
+++ b/third_party/WebKit/Source/core/frame/FrameSerializer.h
@@ -69,6 +69,9 @@ class CORE_EXPORT FrameSerializer final {
 
   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;