GuestView: Fix message routing across embedder navigations

content/public/browser/browser_plugin_guest_manager.h

Index: content/public/browser/browser_plugin_guest_manager.h
diff --git a/content/public/browser/browser_plugin_guest_manager.h b/content/public/browser/browser_plugin_guest_manager.h
index 481a8ab6517ea603ad85997fb8798533ee022de6..0ab13c0188882c44844e982d271a4853a6a2a26c 100644
--- a/content/public/browser/browser_plugin_guest_manager.h
+++ b/content/public/browser/browser_plugin_guest_manager.h
@@ -19,9 +19,8 @@ class CONTENT_EXPORT BrowserPluginGuestManager {
   virtual ~BrowserPluginGuestManager() {}
 
   // Requests a guest WebContents associated with the provided
-  // |browser_plugin_instance_id|.
-  // Returns the guest associated with the provided ID if one exists.
-  virtual WebContents* GetGuestByInstanceID(WebContents* embedder_web_contents,
+  // <owner_process_id, browser_plugin_instance_id> tuple.
+  virtual WebContents* GetGuestByInstanceID(int owner_process_id,
                                             int browser_plugin_instance_id);
 
   // Iterates over all WebContents belonging to a given |embedder_web_contents|,