Refactor "options" argument to getUserMedia to be a dictionary

Source/modules/mediastream/UserMediaRequest.h

Index: Source/modules/mediastream/UserMediaRequest.h
diff --git a/Source/modules/mediastream/UserMediaRequest.h b/Source/modules/mediastream/UserMediaRequest.h
index 0a18a2383ba519863af16a31651ced14f912ca03..36a16f85aca5447f34a7b2739e4492d17de54830 100644
--- a/Source/modules/mediastream/UserMediaRequest.h
+++ b/Source/modules/mediastream/UserMediaRequest.h
@@ -45,13 +45,14 @@ namespace blink {
 class Dictionary;
 class Document;
 class ExceptionState;
+class MediaStreamConstraints;
 class MediaStreamDescriptor;
 class UserMediaController;
 
 class MODULES_EXPORT UserMediaRequest final : public GarbageCollectedFinalized<UserMediaRequest>, public ContextLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(UserMediaRequest);
 public:
-    static UserMediaRequest* create(ExecutionContext*, UserMediaController*, const Dictionary& options, NavigatorUserMediaSuccessCallback*, NavigatorUserMediaErrorCallback*, ExceptionState&);
+    static UserMediaRequest* create(ExecutionContext*, UserMediaController*, const MediaStreamConstraints& options, NavigatorUserMediaSuccessCallback*, NavigatorUserMediaErrorCallback*, ExceptionState&);
     virtual ~UserMediaRequest();
 
     NavigatorUserMediaSuccessCallback* successCallback() const { return m_successCallback.get(); }