Add deprecation warnings for permission API usage from iframes

third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp

Index: third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
diff --git a/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp b/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
index ad4478cb2e25196e498d6b7bf6e521908179ca8e..ac73ae61564e02cf1cfd2c5aa14bfd119900954a 100644
--- a/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
+++ b/third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp
@@ -35,11 +35,13 @@
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/frame/Deprecation.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "core/frame/UseCounter.h"
 #include "modules/webmidi/MIDIAccessInitializer.h"
 #include "modules/webmidi/MIDIOptions.h"
+#include "public/platform/WebFeaturePolicyFeature.h"
 
 namespace blink {
 
@@ -91,6 +93,9 @@ ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* script_state,
   }
   UseCounter::CountCrossOriginIframe(
       document, WebFeature::kRequestMIDIAccessIframe_ObscuredByFootprinting);
+  Deprecation::CountDeprecationFeaturePolicy(
+      document, WebFeaturePolicyFeature::kMidiFeature);
+
   return MIDIAccessInitializer::Start(script_state, options);
 }