Cancel MIDI permission request infobar on MIDIAccess stop.

content/public/test/test_browser_context.h

Index: content/public/test/test_browser_context.h
diff --git a/content/public/test/test_browser_context.h b/content/public/test/test_browser_context.h
index 47991805a1c3e650a2b2cbe5757a0d6a6949bb7f..33c120ecf94f5600cf3d25a8fb0740182ff36464 100644
--- a/content/public/test/test_browser_context.h
+++ b/content/public/test/test_browser_context.h
@@ -43,8 +43,14 @@ class TestBrowserContext : public BrowserContext {
   virtual void RequestMIDISysExPermission(
       int render_process_id,
       int render_view_id,
+      int bridge_id,
       const GURL& requesting_frame,
       const MIDISysExPermissionCallback& callback) OVERRIDE;
+  virtual void CancelMIDISysExPermissionRequest(
+        int render_process_id,
+        int render_view_id,
+        int bridge_id,
+        const GURL& requesting_frame) OVERRIDE {}
   virtual ResourceContext* GetResourceContext() OVERRIDE;
   virtual GeolocationPermissionContext*
       GetGeolocationPermissionContext() OVERRIDE;