fix(aws-resrjson-server): fix the failing protocol test

Author: smilkuri

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AwsProtocolUtils.java

@@ -399,12 +399,6 @@ private static boolean filterMalformedRequestTests(
             || testCase.getId().equals("RestJsonWithBodyExpectsApplicationJsonContentTypeNoHeaders")) {
             return true;
         }
-
-        // ToDo: https://github.com/aws/aws-sdk-js-v3/issues/6907
-        if (testCase.getId().equals("RestJsonWithoutBodyEmptyInputExpectsEmptyContentType")) {
-            return true;
-        }
-
         return false;
     }
 }

private/aws-restjson-server/src/protocols/Aws_restJson1.ts

@@ -2053,7 +2053,7 @@ export const deserializeMalformedContentTypeWithoutBodyEmptyInputRequest = async
   );
   if (contentTypeHeaderKey != null) {
     const contentType = output.headers[contentTypeHeaderKey];
-    if (contentType !== undefined && contentType !== "application/json") {
+    if (contentType !== undefined) {
       throw new __UnsupportedMediaTypeException();
     }
   }