Issue 1171: Failing to regenerate deleted output js file.

compiler/java/com/google/dart/compiler/DartCompiler.java

Index: compiler/java/com/google/dart/compiler/DartCompiler.java
diff --git a/compiler/java/com/google/dart/compiler/DartCompiler.java b/compiler/java/com/google/dart/compiler/DartCompiler.java
index dfafbabbf3ce1e6ee09700af9e29c5b07d6c0390..6aff5e63ec0fc813e4816e61470be3050a2ab80d 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -172,9 +172,13 @@ public class DartCompiler {
           return;
         }
         if (!context.getFilesHaveChanged()) {
-          return;
+          for (Backend be : backends) {
+            if(context.isOutOfDate(app, app, be.getAppExtension())) {
+              packageApp = true;
+              break;
+            }
+          }
         }
-
         compileLibraries();
         packageApp();
       } catch (IOException e) {
@@ -206,9 +210,6 @@ public class DartCompiler {
         if (incremental) {
           addOutOfDateDeps();
         }
-        if (!context.getFilesHaveChanged()) {
-          return library;
-        }
         if (!config.resolveDespiteParseErrors() && (context.getErrorCount() > 0)) {
           return library;
         }