Fix bugs for internal integration.

conformance/failure_list_java.txt

@@ -19,8 +19,6 @@ Recommended.JsonInput.DoubleFieldNanNotQuoted
 Recommended.JsonInput.DoubleFieldNegativeInfinityNotQuoted
 Recommended.JsonInput.FieldMaskInvalidCharacter
 Recommended.JsonInput.FieldNameDuplicate
-Recommended.JsonInput.FieldNameInLowerCamelCase.Validator
-Recommended.JsonInput.FieldNameInSnakeCase.ProtobufOutput
 Recommended.JsonInput.FieldNameNotQuoted
 Recommended.JsonInput.FieldNameWithDoubleUnderscores.JsonOutput
 Recommended.JsonInput.FieldNameWithDoubleUnderscores.ProtobufOutput
@@ -37,10 +35,12 @@ Recommended.JsonInput.StringFieldSingleQuoteValue
 Recommended.JsonInput.StringFieldSurrogateInWrongOrder
 Recommended.JsonInput.StringFieldUnpairedHighSurrogate
 Recommended.JsonInput.StringFieldUnpairedLowSurrogate
-Recommended.JsonInput.StringFieldUppercaseEscapeLetter
 Recommended.JsonInput.Uint32MapFieldKeyNotQuoted
 Recommended.JsonInput.Uint64MapFieldKeyNotQuoted
 Required.JsonInput.EnumFieldNotQuoted
+Required.JsonInput.FieldNameInLowerCamelCase.Validator
+Required.JsonInput.FieldNameInSnakeCase.JsonOutput
+Required.JsonInput.FieldNameInSnakeCase.ProtobufOutput
 Required.JsonInput.Int32FieldLeadingZero
 Required.JsonInput.Int32FieldNegativeWithLeadingZero
 Required.JsonInput.Int32FieldPlusSign