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

third_party/WebKit/Source/core/page/ValidationMessageClient.h

Index: third_party/WebKit/Source/core/page/ValidationMessageClient.h
diff --git a/third_party/WebKit/Source/core/page/ValidationMessageClient.h b/third_party/WebKit/Source/core/page/ValidationMessageClient.h
index 667f9271770a68b79ae296f20b2a216f5dd48fee..396f4b56b401244bfedb91a72d4f6fc3f46edd21 100644
--- a/third_party/WebKit/Source/core/page/ValidationMessageClient.h
+++ b/third_party/WebKit/Source/core/page/ValidationMessageClient.h
@@ -32,6 +32,7 @@
 
 namespace blink {
 
+class Document;
 class Element;
 
 class ValidationMessageClient : public GarbageCollectedMixin {
@@ -55,6 +56,9 @@
   // is visible.
   virtual bool IsValidationMessageVisible(const Element& anchor) = 0;
 
+  virtual void WillUnloadDocument(const Document&) = 0;
+  virtual void DocumentDetached(const Document&) = 0;
+
   virtual void WillBeDestroyed() = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}