Don't put spaces in empty for loop clauses.

test/whitespace/for.stmt

 40 columns                              |
 >>> DO place spaces around in, and after each ; in a loop.
 for (var i = 0;i<100;i++) {
   print(i);
 }
 <<<
 for (var i = 0; i < 100; i++) {
   print(i);
 }
->>> empty clauses TODO(rnystrom): Is this what we want?
+>>> empty clauses
 for(;;);
 <<<
-for ( ; ; );
+for (;;);
+>>> empty initializer clause
+for (  ;   foo; bar) {}
+<<<
+for (; foo; bar) {}
 >>> whitespace
 for (var    file  in  files   ) {
   print(file);
 }
 <<<
 for (var file in files) {
   print(file);
 }
 >>> for-in with type
 for (Foo foo in bar.foos) {
@@ skipping 38 matching lines @@
   print(a);
 }
 >>>
 for (x in xs) {
   print(x);
 }
 <<<
 for (x in xs) {
   print(x);
 }