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

third_party/WebKit/Source/core/page/Page.cpp

Index: third_party/WebKit/Source/core/page/Page.cpp
diff --git a/third_party/WebKit/Source/core/page/Page.cpp b/third_party/WebKit/Source/core/page/Page.cpp
index 38312cd3c29afc2b7f6c141751959ee6839aef00..4a083020409fba2b7999b1c52cfb1bf00e5c6589 100644
--- a/third_party/WebKit/Source/core/page/Page.cpp
+++ b/third_party/WebKit/Source/core/page/Page.cpp
@@ -253,9 +253,16 @@
   main_frame_ = main_frame;
 }
 
+void Page::WillUnloadDocument(const Document& document) {
+  if (validation_message_client_)
+    validation_message_client_->WillUnloadDocument(document);
+}
+
 void Page::DocumentDetached(Document* document) {
   pointer_lock_controller_->DocumentDetached(document);
   context_menu_controller_->DocumentDetached(document);
+  if (validation_message_client_)
+    validation_message_client_->DocumentDetached(*document);
   hosts_using_features_.DocumentDetached(*document);
 }