test: remove unreachable code

There is no way a line can be called after throwing an exception.

test/message/throw_custom_error.js

@@ -6,5 +6,3 @@ console.error('before');
 
 // custom error throwing
 throw ({ name: 'MyCustomError', message: 'This is a custom message' });
-
-console.error('after');

test/message/throw_non_error.js

@@ -6,5 +6,3 @@ console.error('before');
 
 // custom error throwing
 throw ({ foo: 'bar' });
-
-console.error('after');

test/parallel/test-domain.js

@@ -163,7 +163,6 @@ expectCaught++;
 // as a callback instead.
 function fn(er) {
   throw new Error('This function should never be called!');
-  process.exit(1);
 }
 
 var bound = d.intercept(fn);

test/parallel/test-file-write-stream.js

@@ -26,7 +26,6 @@ file
     })
   .on('error', function(err) {
       throw err;
-      console.error('error!', err.stack);
     })
   .on('drain', function() {
       console.error('drain!', callbacks.drain);

test/parallel/test-http-content-length.js

@@ -40,7 +40,6 @@ var server = http.createServer(function(req, res) {
       break;
     default:
       throw new Error('Unreachable');
-      break;
   }
 
   receivedRequests++;

test/parallel/test-listen-fd-detached-inherit.js

@@ -64,8 +64,8 @@ function test() {
 // Then output the child's pid, and immediately exit.
 function parent() {
   var server = net.createServer(function(conn) {
-    throw new Error('Should not see connections on parent');
     conn.end('HTTP/1.1 403 Forbidden\r\n\r\nI got problems.\r\n');
+    throw new Error('Should not see connections on parent');
   }).listen(PORT, function() {
     console.error('server listening on %d', PORT);