M54: Revert r414590

third_party/WebKit/Source/core/html/HTMLFormElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLFormElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
index cad32c32094f2f608d397fb48bc0640a889ca013..3ed36013bfab9cb086e363b8bccc26f0c515ad61 100644
--- a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
@@ -340,12 +340,9 @@ void HTMLFormElement::submit(Event* event, HTMLFormControlElement* submitButton)
     if (!view || !frame || !frame->page())
         return;
 
-    // https://html.spec.whatwg.org/multipage/forms.html#form-submission-algorithm
-    // 2. If form document is not connected, has no associated browsing context,
-    // or its active sandboxing flag set has its sandboxed forms browsing
-    // context flag set, then abort these steps without doing anything.
+    // See crbug.com/586749.
     if (!isConnected())
-        return;
+        UseCounter::count(document(), UseCounter::FormSubmissionNotInDocumentTree);
 
     if (m_isSubmitting)
         return;