Destruct CodedOutputStream instead of using Trim()

src/google/protobuf/compiler/command_line_interface.cc

@@ -2229,6 +2229,7 @@ bool CommandLineInterface::WriteDescriptorSet(
 
   io::FileOutputStream out(fd);
 
+  {
     io::CodedOutputStream coded_out(&out);
     // Determinism is useful here because build outputs are sometimes checked
     // into version control.
@@ -2239,7 +2240,8 @@ bool CommandLineInterface::WriteDescriptorSet(
       out.Close();
       return false;
     }
-  coded_out.Trim();
+  }
+
   if (!out.Close()) {
     std::cerr << descriptor_set_out_name_ << ": " << strerror(out.GetErrno())
               << std::endl;