Clean up the PermissionInfoBarDelegate hierarchy.

chrome/browser/media/midi_permission_infobar_delegate_android.cc

Index: chrome/browser/media/midi_permission_infobar_delegate_android.cc
diff --git a/chrome/browser/media/midi_permission_infobar_delegate_android.cc b/chrome/browser/media/midi_permission_infobar_delegate_android.cc
index d16857cbd1ef1a6bea7e6a385fbe039fa6ef785b..d4e81aa9bd95fbd056a86a29683274b71f1621c3 100644
--- a/chrome/browser/media/midi_permission_infobar_delegate_android.cc
+++ b/chrome/browser/media/midi_permission_infobar_delegate_android.cc
@@ -17,7 +17,7 @@ infobars::InfoBar* MidiPermissionInfoBarDelegateAndroid::Create(
     Profile* profile,
     const PermissionSetCallback& callback) {
   return infobar_service->AddInfoBar(
-      CreatePermissionInfoBar(std::unique_ptr<PermissionInfobarDelegate>(
+      CreatePermissionInfoBar(std::unique_ptr<PermissionInfoBarDelegate>(
           new MidiPermissionInfoBarDelegateAndroid(
               requesting_frame, user_gesture, profile, callback))));
 }
@@ -27,13 +27,12 @@ MidiPermissionInfoBarDelegateAndroid::MidiPermissionInfoBarDelegateAndroid(
     bool user_gesture,
     Profile* profile,
     const PermissionSetCallback& callback)
-    : PermissionInfobarDelegate(requesting_frame,
-                                content::PermissionType::MIDI_SYSEX,
-                                CONTENT_SETTINGS_TYPE_MIDI_SYSEX,
-                                user_gesture,
-                                profile,
-                                callback),
-      requesting_frame_(requesting_frame) {}
+    : SinglePermissionInfoBarDelegate(requesting_frame,
+                                      content::PermissionType::MIDI_SYSEX,
+                                      CONTENT_SETTINGS_TYPE_MIDI_SYSEX,
+                                      user_gesture,
+                                      profile,
+                                      callback) {}
 
 MidiPermissionInfoBarDelegateAndroid::~MidiPermissionInfoBarDelegateAndroid() {}