Remove extra from getJavaType.

Bug: 32559427
Test: hidl_test_java

Change-Id: I1a96630eed1b61ab4ff2959ced2e83f94e8fb36d
diff --git a/ScalarType.cpp b/ScalarType.cpp
index f537310..0e4beaf 100644
--- a/ScalarType.cpp
+++ b/ScalarType.cpp
@@ -55,8 +55,7 @@
     return kName[mKind];
 }
 
-std::string ScalarType::getJavaType(
-        std::string *extra, bool /* forInitializer */) const {
+std::string ScalarType::getJavaType(bool /* forInitializer */) const {
     static const char *const kName[] = {
         "boolean",
         "byte",
@@ -71,7 +70,6 @@
         "double"
     };
 
-    extra->clear();
     return kName[mKind];
 }