Issue 14580. Fix for Source in which problem is reported.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java
index 67b59594c7ff6938e02137c214a7658753df9f57..94e7e2d343c6fb518bfc62edbe552c3abd5c3b8c 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/scope/LibraryImportScope.java
@@ -14,9 +14,7 @@
 package com.google.dart.engine.internal.scope;
 
 import com.google.dart.engine.AnalysisEngine;
-import com.google.dart.engine.ast.CompilationUnit;
 import com.google.dart.engine.ast.Identifier;
-import com.google.dart.engine.element.CompilationUnitElement;
 import com.google.dart.engine.element.Element;
 import com.google.dart.engine.element.ImportElement;
 import com.google.dart.engine.element.LibraryElement;
@@ -24,7 +22,6 @@ import com.google.dart.engine.error.AnalysisError;
 import com.google.dart.engine.error.AnalysisErrorListener;
 import com.google.dart.engine.error.StaticWarningCode;
 import com.google.dart.engine.internal.element.MultiplyDefinedElementImpl;
-import com.google.dart.engine.source.Source;
 
 import java.util.ArrayList;
 
@@ -72,11 +69,6 @@ public class LibraryImportScope extends Scope {
   }
 
   @Override
-  public LibraryElement getDefiningLibrary() {
-    return definingLibrary;
-  }
-
-  @Override
   public AnalysisErrorListener getErrorListener() {
     return errorListener;
   }
@@ -159,27 +151,6 @@ public class LibraryImportScope extends Scope {
   }
 
   /**
-   * Return the source that contains the given identifier, or the source associated with this scope
-   * if the source containing the identifier could not be determined.
-   * 
-   * @param identifier the identifier whose source is to be returned
-   * @return the source that contains the given identifier
-   */
-  private Source getSource(Identifier identifier) {
-    CompilationUnit unit = identifier.getAncestor(CompilationUnit.class);
-    if (unit != null) {
-      CompilationUnitElement element = unit.getElement();
-      if (element != null) {
-        Source source = element.getSource();
-        if (source != null) {
-          return source;
-        }
-      }
-    }
-    return getSource();
-  }
-
-  /**
    * Given a collection of elements that a single name could all be mapped to, remove from the list
    * all of the names defined in the SDK. Return the element(s) that remain.
    *