Dismiss browser plugin modal dialogs when the embedder needs to.

content/browser/browser_plugin/browser_plugin_embedder.h

Index: content/browser/browser_plugin/browser_plugin_embedder.h
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.h b/content/browser/browser_plugin/browser_plugin_embedder.h
index 721814f504fd19807159c2fa3c96040f80d8f526..842d3ee1b03835fbf3dceb8b5fde44931cc32460 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.h
+++ b/content/browser/browser_plugin/browser_plugin_embedder.h
@@ -56,6 +56,9 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
   // Called when the screen info has changed.
   void ScreenInfoChanged();
 
+  // Closes modal dialogs in all of the guests.
+  void CancelGuestDialogs();
+
   // Called by WebContentsViewGuest when a drag operation is started within
   // |guest|. This |guest| will be signaled at the end of the drag operation.
   void StartDrag(BrowserPluginGuest* guest);
@@ -84,6 +87,9 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
   // Notifies a guest that the embedder's screen info has changed.
   static bool NotifyScreenInfoChanged(WebContents* guest_web_contents);
 
+  // Closes modal dialogs in |guest_web_contents|.
+  static bool CancelDialogs(WebContents* guest_web_contents);
+
   static bool UnlockMouseIfNecessaryCallback(bool* mouse_unlocked,
                                              WebContents* guest);