Remove extra from getJavaType.

Bug: 32559427
Test: hidl_test_java

Change-Id: I1a96630eed1b61ab4ff2959ced2e83f94e8fb36d
diff --git a/StringType.h b/StringType.h
index 587cc68..d161fdb 100644
--- a/StringType.h
+++ b/StringType.h
@@ -31,8 +31,7 @@
             StorageMode mode,
             bool specifyNamespaces) const override;
 
-    std::string getJavaType(
-            std::string *extra, bool /* forInitializer */) const override;
+    std::string getJavaType(bool /* forInitializer */) const override;
 
     std::string getJavaSuffix() const override;