Finished reorganising project structure.

js/js.iml

@@ -7,6 +7,7 @@
     </content>
     <orderEntry type="jdk" jdkName="1.7" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="libs" level="project" />
   </component>
 </module>
 

js/src/com/google/dart/compiler/backend/js/ast/JsProgram.java

@@ -4,8 +4,6 @@
 
 package com.google.dart.compiler.backend.js.ast;
 
-import org.jetbrains.annotations.Nullable;
-
 import java.util.HashMap;
 import java.util.Map;
 
@@ -158,7 +156,7 @@ public final class JsProgram extends JsNode {
   }
 
   @Override
-  public void traverse(JsVisitor v, @Nullable JsContext ctx) {
+  public void traverse(JsVisitor v, JsContext ctx) {
     if (v.visit(this, ctx)) {
       for (JsProgramFragment fragment : fragments) {
         v.accept(fragment);

js/src/com/google/dart/compiler/util/AstUtil.java

@@ -7,8 +7,6 @@ package com.google.dart.compiler.util;
 import com.google.dart.compiler.InternalCompilerException;
 import com.google.dart.compiler.backend.js.ast.*;
 import com.google.dart.compiler.common.SourceInfo;
-import org.jetbrains.annotations.Nullable;
-
 import java.util.List;
 
 /**
@@ -170,7 +168,7 @@ public class AstUtil {
     }
 
     public static JsFunction newFunction(
-            JsScope scope, @Nullable JsName name, List<JsParameter> params, JsBlock body) {
+            JsScope scope, JsName name, List<JsParameter> params, JsBlock body) {
         JsFunction fn = new JsFunction(scope);
         if (name != null) {
             fn.setName(name);