Convert encryptedmedia code to use bindings enumerations

We had needless conversions from strings -> enums and back.

Bug: 366411876, 370425456
Change-Id: I6e7b0dbb55e8432206cb442115d8793178e7c11a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5925119
Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1367811}

Author: dtapuska

third_party/blink/renderer/modules/encryptedmedia/media_key_message_event.cc

@@ -29,17 +29,12 @@
 
 namespace blink {
 
-MediaKeyMessageEvent::MediaKeyMessageEvent() = default;
-
 MediaKeyMessageEvent::MediaKeyMessageEvent(
     const AtomicString& type,
     const MediaKeyMessageEventInit* initializer)
-    : Event(type, initializer) {
-  if (initializer->hasMessageType())
-    message_type_ = String(initializer->messageType());
-  if (initializer->hasMessage())
-    message_ = initializer->message();
-}
+    : Event(type, initializer),
+      message_type_(initializer->messageType()),
+      message_(initializer->message()) {}
 
 MediaKeyMessageEvent::~MediaKeyMessageEvent() = default;
 

third_party/blink/renderer/modules/encryptedmedia/media_key_message_event.h

@@ -28,6 +28,7 @@
 #define THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_MEDIA_KEY_MESSAGE_EVENT_H_
 
 #include "third_party/blink/renderer/bindings/modules/v8/v8_media_key_message_event_init.h"
+#include "third_party/blink/renderer/bindings/modules/v8/v8_media_key_message_type.h"
 #include "third_party/blink/renderer/modules/event_modules.h"
 
 namespace blink {
@@ -38,15 +39,10 @@ class MediaKeyMessageEvent final : public Event {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
-  MediaKeyMessageEvent();
   MediaKeyMessageEvent(const AtomicString& type,
                        const MediaKeyMessageEventInit* initializer);
   ~MediaKeyMessageEvent() override;
 
-  static MediaKeyMessageEvent* Create() {
-    return MakeGarbageCollected<MediaKeyMessageEvent>();
-  }
-
   static MediaKeyMessageEvent* Create(
       const AtomicString& type,
       const MediaKeyMessageEventInit* initializer) {
@@ -55,13 +51,13 @@ class MediaKeyMessageEvent final : public Event {
 
   const AtomicString& InterfaceName() const override;
 
-  String messageType() const { return message_type_; }
+  const V8MediaKeyMessageType& messageType() const { return message_type_; }
   DOMArrayBuffer* message() const { return message_.Get(); }
 
   void Trace(Visitor*) const override;
 
  private:
-  String message_type_;
+  const V8MediaKeyMessageType message_type_;
   Member<DOMArrayBuffer> message_;
 };