Cancel MIDI permission request infobar on MIDIAccess stop.

content/shell/browser/shell_browser_context.h

Index: content/shell/browser/shell_browser_context.h
diff --git a/content/shell/browser/shell_browser_context.h b/content/shell/browser/shell_browser_context.h
index ec7159166df0d90ecb294fde5b49cfb29756d231..15888e8a7b558f46cdf2f5a25a2e0e7b684696ee 100644
--- a/content/shell/browser/shell_browser_context.h
+++ b/content/shell/browser/shell_browser_context.h
@@ -46,8 +46,14 @@ class ShellBrowserContext : 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 {}

[jochen (gone - plz use gerrit), 2013/10/29 14:17:06]

sorry for being not precise.

why do you override this method at all? The base class' implementation is
already empty, so you shouldn't need the method here at all.

   virtual ResourceContext* GetResourceContext() OVERRIDE;
   virtual GeolocationPermissionContext*
       GetGeolocationPermissionContext() OVERRIDE;