Rollback "If NTI and --checks_only are both enabled, skip running OTI"

Broke internal Google projects.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160530096

src/com/google/javascript/jscomp/DefaultPassConfig.java

@@ -398,7 +398,7 @@ protected List<PassFactory> getChecks() {
     // In addition, I will probably have a local edit of the repo that retains both
     // types on Nodes, so I can test full builds on my machine. We can't check in such
     // a change because it would greatly increase memory usage.
-    if (options.getNewTypeInference() && !options.checksOnly) {
+    if (options.getNewTypeInference()) {
       addOldTypeCheckerPasses(checks, options);
     }