fixed getHeaderNames signature

org.springframework.web/src/main/java/org/springframework/web/multipart/MultipartFile.java

@@ -124,6 +124,6 @@ public interface MultipartFile {
 	 * @return the names of the headers
 	 * @since 3.1
 	 */
-	Iterator<String> getHeaderNames(String name);
+	Iterator<String> getHeaderNames();
 
 }

org.springframework.web/src/main/java/org/springframework/web/multipart/commons/CommonsMultipartFile.java

@@ -209,7 +209,7 @@ public class CommonsMultipartFile implements MultipartFile, Serializable {
 		}
 	}
 
-	public Iterator<String> getHeaderNames(String name) {
+	public Iterator<String> getHeaderNames() {
 		return Collections.singleton(CONTENT_TYPE).iterator();
 	}
 

org.springframework.web/src/main/java/org/springframework/web/multipart/support/StandardServletMultipartResolver.java

@@ -161,7 +161,7 @@ public class StandardServletMultipartResolver implements MultipartResolver {
 			return (headers != null ? StringUtils.toStringArray(headers) : null);
 		}
 
-		public Iterator<String> getHeaderNames(String name) {
+		public Iterator<String> getHeaderNames() {
 			return this.part.getHeaderNames().iterator();
 		}
 	}

org.springframework.web/src/test/java/org/springframework/mock/web/MockMultipartFile.java

@@ -151,7 +151,7 @@ public class MockMultipartFile implements MultipartFile {
 		}
 	}
 
-	public Iterator<String> getHeaderNames(String name) {
+	public Iterator<String> getHeaderNames() {
 		return Collections.singleton(CONTENT_TYPE).iterator();
 	}