minidump: Change the ownership model

minidump/minidump_string_writer.cc

Index: minidump/minidump_string_writer.cc
diff --git a/minidump/minidump_string_writer.cc b/minidump/minidump_string_writer.cc
index f3623d8aef1084634690a47a2a71926272e6a855..8bcb7028aa25edc05e96a2ef75d725c0037b21b2 100644
--- a/minidump/minidump_string_writer.cc
+++ b/minidump/minidump_string_writer.cc
@@ -83,11 +83,17 @@ bool MinidumpStringWriter<Traits>::WriteObject(
 template class MinidumpStringWriter<MinidumpStringWriterUTF16Traits>;
 template class MinidumpStringWriter<MinidumpStringWriterUTF8Traits>;
 
+MinidumpUTF16StringWriter::~MinidumpUTF16StringWriter() {
+}
+
 void MinidumpUTF16StringWriter::SetUTF8(const std::string& string_utf8) {
   DCHECK_EQ(state(), kStateMutable);
 
   set_string(MinidumpWriterUtil::ConvertUTF8ToUTF16(string_utf8));
 }
 
+MinidumpUTF8StringWriter::~MinidumpUTF8StringWriter() {
+}
+
 }  // namespace internal
 }  // namespace crashpad