window.print() should close form validation bubble.

third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp

Index: third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp b/third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp
index 0608b48da7ec413276a3cd293be6a155b1403429..784a1a268f95bb54b75f416598738cbb8f738d46 100644
--- a/third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp
@@ -84,6 +84,7 @@ void ValidationMessageClientImpl::ShowValidationMessage(
   web_view_.Client()->ShowValidationMessage(
       anchor_in_viewport, message_, ToWebTextDirection(message_dir),
       sub_message, ToWebTextDirection(sub_message_dir));
+  web_view_.ChromeClient().RegisterPopupOpeningObserver(this);
 
   finish_time_ =
       MonotonicallyIncreasingTime() +
@@ -105,6 +106,7 @@ void ValidationMessageClientImpl::HideValidationMessage(const Element& anchor) {
   message_ = String();
   finish_time_ = 0;
   web_view_.Client()->HideValidationMessage();
+  web_view_.ChromeClient().UnregisterPopupOpeningObserver(this);
 }
 
 bool ValidationMessageClientImpl::IsValidationMessageVisible(
@@ -152,6 +154,11 @@ void ValidationMessageClientImpl::WillBeDestroyed() {
     HideValidationMessage(*current_anchor_);
 }
 
+void ValidationMessageClientImpl::WillOpenPopup() {
+  if (current_anchor_)
+    HideValidationMessage(*current_anchor_);
+}
+
 DEFINE_TRACE(ValidationMessageClientImpl) {
   visitor->Trace(current_anchor_);
   ValidationMessageClient::Trace(visitor);