Prevent "complete" file from being cached across compilation sessions to save space

compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java

Index: compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
===================================================================
--- compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java	(revision 2085)
+++ compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java	(working copy)
@@ -30,6 +30,8 @@
  */
 public class JavascriptBackend extends AbstractJsBackend  {
 
+  public static final String EXTENSION_APP_JS_COMPLETE = EXTENSION_APP_JS + ".complete";
+
   /**
    * Wraps an Appendable and keeps track of the current offset as line/columns.
    */
@@ -162,7 +164,7 @@
     String completeArtifactName = EXTENSION_APP_JS;
     if (hasEntryPoint) {
       // Apps with entry points will be reduced so we write into a different file name
-      completeArtifactName = "complete." + EXTENSION_APP_JS;
+      completeArtifactName = EXTENSION_APP_JS_COMPLETE;
     }
     
     Writer out = context.getArtifactWriter(app, "", completeArtifactName);
@@ -179,7 +181,6 @@
     
     
     if (hasEntryPoint) {
-      Reader artifactReader = context.getArtifactReader(app, "", completeArtifactName);
       Writer artifactWriter = context.getArtifactWriter(app, "", EXTENSION_APP_JS);
       try {
         failed = true;
@@ -187,7 +188,6 @@
         failed = false;  
       } finally {
         Closeables.close(artifactWriter, failed);
-        Closeables.close(artifactReader, failed);
       }
     }