Fix regression for import suggestions

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index a33d280fe75cd346087c593f82cef1cadc3ab2d0..7a3df8960b16a1379516c43e599072e4baccd119 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -1516,7 +1516,7 @@ class FixProcessor {
         }
         // prepare LibraryElement
         LibraryElement libraryElement =
-            context.getResult(librarySource, LIBRARY_ELEMENT8);
+            context.getResult(librarySource, LIBRARY_ELEMENT4);

[scheglov, 2016/03/09 19:05:32]

Do you need LIBRARY_ELEMENT4 or LIBRARY_ELEMENT1 would be enough?

[skybrian, 2016/03/09 19:15:05]

I don't know; LIBRARY_ELEMENT4 was based on your suggestion.

There is a test now, so if we stop building LIBRARY_ELEMENT4 in this situation,
it will fail and we can choose something else.

[scheglov, 2016/03/09 19:18:21]

Well, ideally we need to use the lowest level.

[skybrian, 2016/03/09 19:33:47]

This fix uses getExportNamespaceForLibrary() on the LibraryElement. According to
the comment on LIBRARY_ELEMENT4, it sets exportNamespace. So it looks like
LIBRARY_ELEMENT4 is correct.

[scheglov, 2016/03/09 19:36:07]

OK, thank you for checking this.

         if (libraryElement == null) {
           continue;
         }