Remove trailing spaces in analyzer_experimental

editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java

Index: editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java
diff --git a/editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java b/editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java
index bb9dbf75fdae3d4ceffe445948fba5412f12e1ae..84eb887cb69539443f7a58f70f3b79ce4b4a4189 100644
--- a/editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java
+++ b/editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/engine/MainEngine.java
@@ -1031,7 +1031,9 @@ public class MainEngine {
     PrintStringWriter writer = new PrintStringWriter();
     writer.append(HEADER);
     node.accept(new ToFormattedSourceVisitor(writer));
-    return writer.toString();
+    String source = writer.toString();
+    source = removeTrailingWhitespaces(source);
+    return source;
   }
 
   /**
@@ -1051,4 +1053,15 @@ public class MainEngine {
     return file.getAbsolutePath().startsWith(
         engineTestFolder.getAbsolutePath() + "/com/google/dart/engine/" + enginePackage);
   }
+
+  /**
+   * Removes trailing spaces from the given Dart source.
+   */
+  private static String removeTrailingWhitespaces(String source) {
+    String[] lines = StringUtils.split(source, '\n');
+    for (int i = 0; i < lines.length; i++) {
+      lines[i] = StringUtils.stripEnd(lines[i], null);
+    }
+    return StringUtils.join(lines, "\n");
+  }
 }