Step back and remove more getNode() invocations

compiler/java/com/google/dart/compiler/common/HasSourceInfoSetter.java

Index: compiler/java/com/google/dart/compiler/common/HasSourceInfoSetter.java
diff --git a/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java b/compiler/java/com/google/dart/compiler/common/HasSourceInfoSetter.java
similarity index 55%
copy from compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
copy to compiler/java/com/google/dart/compiler/common/HasSourceInfoSetter.java
index 105aa68e1f5600d27f0e50e5f95837d52f5b3b1f..6d419429aa7ed64b3ee6ebd9a3f87a608e10b20f 100644
--- a/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
+++ b/compiler/java/com/google/dart/compiler/common/HasSourceInfoSetter.java
@@ -5,18 +5,12 @@
 package com.google.dart.compiler.common;
 
 /**
- * Abstract view of a class that has source info.
+ * Object for which you can set new {@link SourceInfo}.
  */
-public interface HasSourceInfo {
-
-  /**
-   * @return the {@link SourceInfo} associated with this object. May be {@link SourceInfo#UNKNOWN}
-   *         but not <code>null</code>.
-   */
-  SourceInfo getSourceInfo();
+public interface HasSourceInfoSetter {
 
   /**
    * Set the {@link SourceInfo} associated with this object. May only be called only once.
    */
-  void setSourceInfo(SourceInfo info);
+  void setSourceInfo(SourceInfo sourceInfo);
 }