Move navigation-induced hiding of form-validation-bubble to the browser process.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/HTMLFormControlElement.h"
 
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/html/HTMLInputElement.h"
@@ skipping 23 matching lines @@
 
   void HideValidationMessage(const Element& anchor) override {
     if (anchor_ == &anchor)
       anchor_ = nullptr;
   }
 
   bool IsValidationMessageVisible(const Element& anchor) override {
     return anchor_ == &anchor;
   }
 
-  void WillUnloadDocument(const Document&) override {}
-  void DocumentDetached(const Document&) override {}
   void WillBeDestroyed() override {}
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->Trace(anchor_);
     ValidationMessageClient::Trace(visitor);
   }
 
  private:
   Member<const Element> anchor_;
 };
 }
@@ skipping 77 matching lines @@
   Page::OrdinaryPages().insert(&GetPage());
 
   HTMLInputElement* input =
       toHTMLInputElement(GetDocument().getElementById("input"));
   ScopedPageSuspender suspender;  // print() suspends the page.
   input->reportValidity();
   EXPECT_FALSE(validation_message_client->IsValidationMessageVisible(*input));
 }
 
 }  // namespace blink