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

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

Index: third_party/WebKit/Source/core/page/ValidationMessageClientImpl.cpp
diff --git a/third_party/WebKit/Source/core/page/ValidationMessageClientImpl.cpp b/third_party/WebKit/Source/core/page/ValidationMessageClientImpl.cpp
index f2e3c3bc44b3c0a71619a3ce8c4b2ea704e121cc..7eb5f345b4ffdfa17687b57604623fbc973667e8 100644
--- a/third_party/WebKit/Source/core/page/ValidationMessageClientImpl.cpp
+++ b/third_party/WebKit/Source/core/page/ValidationMessageClientImpl.cpp
@@ -115,16 +115,11 @@ bool ValidationMessageClientImpl::IsValidationMessageVisible(
   return current_anchor_ == &anchor;
 }
 
-void ValidationMessageClientImpl::WillUnloadDocument(const Document& document) {
+void ValidationMessageClientImpl::DocumentDetached(const Document& document) {
   if (current_anchor_ && current_anchor_->GetDocument() == document)
     HideValidationMessage(*current_anchor_);
 }
 
-void ValidationMessageClientImpl::DocumentDetached(const Document& document) {
-  DCHECK(!current_anchor_ || current_anchor_->GetDocument() != document)
-      << "willUnloadDocument() should be called beforehand.";
-}
-
 void ValidationMessageClientImpl::CheckAnchorStatus(TimerBase*) {
   DCHECK(current_anchor_);
   if (MonotonicallyIncreasingTime() >= finish_time_ || !CurrentView()) {