Cancel MIDI permission request infobar on MIDIAccess stop.

content/shell/browser/shell_browser_context.cc

Index: content/shell/browser/shell_browser_context.cc
diff --git a/content/shell/browser/shell_browser_context.cc b/content/shell/browser/shell_browser_context.cc
index c6dbb9940cb85584b8362f39e294e19edbc65a1a..8dee89a08deeb6992ed13ef2c00447c2032d6c83 100644
--- a/content/shell/browser/shell_browser_context.cc
+++ b/content/shell/browser/shell_browser_context.cc
@@ -179,6 +179,7 @@ net::URLRequestContextGetter*
 void ShellBrowserContext::RequestMIDISysExPermission(
       int render_process_id,
       int render_view_id,
+      int bridge_id,
       const GURL& requesting_frame,
       const MIDISysExPermissionCallback& callback) {
   // Always reject requests for LayoutTests for now.
@@ -191,6 +192,13 @@ void ShellBrowserContext::RequestMIDISysExPermission(
   callback.Run(false);
 }
 
+void ShellBrowserContext::CancelMIDISysExPermissionRequest(
+    int render_process_id,
+    int render_view_id,
+    int bridge_id,
+    const GURL& requesting_frame) {
+}
+
 net::URLRequestContextGetter*
     ShellBrowserContext::CreateRequestContextForStoragePartition(
         const base::FilePath& partition_path,