Visit name of DartDeclaration, set Element for DartIdentifier

compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java

Index: compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java
diff --git a/compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java b/compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java
index 4b68df49a3838f4e8e878255f3b2f6986be430ac..31237321dc929b903abd55234b92e85b854f5fa9 100644
--- a/compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java
+++ b/compiler/java/com/google/dart/compiler/LibraryDepsVisitor.java
@@ -133,12 +133,13 @@ public class LibraryDepsVisitor extends ASTVisitor<Void> {
   private void addElementDependency(Element element) {
     DartSource elementSource = (DartSource) element.getSourceInfo().getSource();
     if (elementSource != null) {
-      URI libUri = elementSource.getLibrary().getUri();
-      LibraryDeps.Dependency dep =
-          new LibraryDeps.Dependency(libUri,
-              elementSource.getName(),
-              elementSource.getLastModified());
-      source.addDep(dep);
+      LibrarySource library = elementSource.getLibrary();
+      if (library != null) {
+        URI libUri = library.getUri();
+        LibraryDeps.Dependency dep = new LibraryDeps.Dependency(libUri, elementSource.getName(),
+            elementSource.getLastModified());
+        source.addDep(dep);
+      }
     }
   }
 }