Make SourceInfo a class, rename its menthods.

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

Index: compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
diff --git a/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java b/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
index bda3da9499657597a2a52fee3bbbd929917c04db..105aa68e1f5600d27f0e50e5f95837d52f5b3b1f 100644
--- a/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
+++ b/compiler/java/com/google/dart/compiler/common/HasSourceInfo.java
@@ -4,52 +4,19 @@
 
 package com.google.dart.compiler.common;
 
-import com.google.dart.compiler.Source;
-
 /**
  * Abstract view of a class that has source info.
  */
 public interface HasSourceInfo {
 
   /**
-   * Return the source info associated with this object.
+   * @return the {@link SourceInfo} associated with this object. May be {@link SourceInfo#UNKNOWN}
+   *         but not <code>null</code>.
    */
   SourceInfo getSourceInfo();
 
   /**
-   * Set the source info associated with this object. May only be called once.
-   * @param info
+   * Set the {@link SourceInfo} associated with this object. May only be called only once.
    */
   void setSourceInfo(SourceInfo info);
-
-  /**
-   * Sets the source range of the original source file where the source fragment
-   * corresponding to this node was found.
-   * 
-   * <p>
-   * Each node in the subtree (other than the contrived nodes) carries source
-   * range(s) information relating back to positions in the given source (the
-   * given source itself is not remembered with the AST). The source range
-   * usually begins at the first character of the first token corresponding to
-   * the node; leading whitespace and comments are <b>not</b> included. The
-   * source range usually extends through the last character of the last token
-   * corresponding to the node; trailing whitespace and comments are <b>not</b>
-   * included. There are a handful of exceptions (including the various body
-   * declarations). Source ranges nest properly: the source range for a child is
-   * always within the source range of its parent, and the source ranges of
-   * sibling nodes never overlap.
-   * 
-   * @param source the associated source
-   * @param line the 1-based line index, or <code>-1</code>, if no source
-   *        location is available
-   * @param column the 1-based column index, or <code>-1</code>, if no source
-   *        location is available
-   * @param startPosition a 0-based character index, or <code>-1</code>, if no
-   *        source location is available
-   * @param length a (possibly 0) length, or <code>-1</code>, if no source
-   *        location is available
-   * @see SourceInfo#getSourceStart()
-   * @see SourceInfo#getSourceLength()
-   */
-  void setSourceLocation(Source source, int line, int column, int startPosition, int length);
 }