Dismiss EME infobar when WebMediaPlayer is destroyed.

chrome/browser/content_settings/permission_request_id.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_REQUEST_ID_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_REQUEST_ID_H_
 
 #include <string>
 
 // Uniquely identifies a particular permission request.
 class PermissionRequestID {
  public:
-  PermissionRequestID(int render_process_id, int render_view_id, int bridge_id);
+  PermissionRequestID(int render_process_id,
+                      int render_view_id,
+                      int bridge_id,
+                      int group_id);
   ~PermissionRequestID();
 
   int render_process_id() const { return render_process_id_; }
   int render_view_id() const { return render_view_id_; }
   int bridge_id() const { return bridge_id_; }
+  int group_id() const { return group_id_; }
 
   bool Equals(const PermissionRequestID& other) const;
   bool IsForSameTabAs(const PermissionRequestID& other) const;
   std::string ToString() const;
 
  private:
   int render_process_id_;
   int render_view_id_;
+  // Id unique to this instance.
   int bridge_id_;
+  // Id possibly shared by multiple instance. This is used in
+  // PermissionQueueController::CancelInfoBarRequests(int group_id) to cancel
+  // multiple permission requests by a group id.
+  // For example, ProtectedMediaIdentifierPermissionContext class uses this.
+  // If you don't use that function, this doesn't matter and setting this to 0
+  // is recommended.
+  int group_id_;
 
   // Purposefully do not disable copying, as this is stored in STL containers.
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_REQUEST_ID_H_