window.print() should close form validation bubble.

third_party/WebKit/Source/web/ValidationMessageClientImpl.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #ifndef ValidationMessageClientImpl_h
 #define ValidationMessageClientImpl_h
 
+#include "core/page/PopupOpeningObserver.h"
 #include "core/page/ValidationMessageClient.h"
 #include "platform/Timer.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 class FrameView;
 class WebViewImpl;
 
 class ValidationMessageClientImpl final
     : public GarbageCollectedFinalized<ValidationMessageClientImpl>,
-      public ValidationMessageClient {
+      public ValidationMessageClient,
+      private PopupOpeningObserver {
   USING_GARBAGE_COLLECTED_MIXIN(ValidationMessageClientImpl);
 
  public:
   static ValidationMessageClientImpl* Create(WebViewImpl&);
   ~ValidationMessageClientImpl() override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   ValidationMessageClientImpl(WebViewImpl&);
   void CheckAnchorStatus(TimerBase*);
   FrameView* CurrentView();
 
   void ShowValidationMessage(const Element& anchor,
                              const String& message,
                              TextDirection message_dir,
                              const String& sub_message,
                              TextDirection sub_message_dir) override;
   void HideValidationMessage(const Element& anchor) override;
   bool IsValidationMessageVisible(const Element& anchor) override;
   void WillUnloadDocument(const Document&) override;
   void DocumentDetached(const Document&) override;
   void WillBeDestroyed() override;
 
+  // PopupOpeningObserver function
+  void WillOpenPopup() override;
+
   WebViewImpl& web_view_;
   Member<const Element> current_anchor_;
   String message_;
   IntRect last_anchor_rect_in_screen_;
   float last_page_scale_factor_;
   double finish_time_;
   std::unique_ptr<TimerBase> timer_;
 };
 
 }  // namespace blink
 
 #endif