Issue 4048. Support for revised library/import syntax

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 f8142b4e1430cd1eb15d63dc500bb57d9f84274b..6560536484bd85e079188959752236de3e1ea4f1 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -390,7 +390,7 @@ public class DartCompiler {
             // Check that the current library is not the embedded library, and
             // that the current library does not already import the embedded
             // library.
-            if (lib != imp && !lib.hasImport(null, imp)) {
+            if (lib != imp && !lib.hasImport(imp)) {
               lib.addImport(imp, null);
             }
           }