Minor fixes for XML persistence generation.

The Android checkstyle configuration requires exactly the string
"CHECKSTYLE: OFF Generated Code" in its SuppressionCommentFilter.

JLS 4.12.4 says try-with-resources declaration is implicitly final,
hence drop the redundant final modifier in generated code.

Test: manual
Change-Id: Idbb703d950601c32aececfc45e480698657ef764

tools/xmlpersistence/src/main/kotlin/Generator.kt

@@ -50,7 +50,7 @@ val FILE_HEADER = """
      */
 
     // Generated by xmlpersistence. DO NOT MODIFY!
-    // CHECKSTYLE:OFF
+    // CHECKSTYLE:OFF Generated code
     // @formatter:off
 """.trimIndent() + "\n\n"
 
@@ -128,9 +128,7 @@ private fun generateReadMethod(rootField: ClassFieldInfo): MethodSpec =
         .addAnnotation(nullableType)
         .addModifiers(Modifier.PUBLIC)
         .returns(rootField.type)
-        .addControlFlow(
-            "try (final \$1T inputStream = mFile.openRead())", FileInputStream::class.java
-        ) {
+        .addControlFlow("try (\$1T inputStream = mFile.openRead())", FileInputStream::class.java) {
             addStatement("final \$1T parser = \$2T.newPullParser()", xmlPullParserType, xmlType)
             addStatement("parser.setInput(inputStream, null)")
             addStatement("return parse(parser)")