Issue 6822. Report error only if import prefix is hidden by top-level element.

compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java

Index: compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java b/compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java
index 8b6f83ca711ed6fd171e9f2cf8e172e773697b87..ee9743b770af253d397631431892a8a911bd9f8e 100644
--- a/compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java
+++ b/compiler/java/com/google/dart/compiler/resolver/ResolutionContext.java
@@ -81,16 +81,6 @@ public class ResolutionContext implements ResolutionErrorListener {
   void declare(Element element, ErrorCode errorCode) {
     String name = element.getName();
     Element existingLocalElement = scope.findLocalElement(name);
-    // Check for duplicate declaration in the enclosing scope.
-    if (existingLocalElement == null) {
-      Element existingElement = scope.findElement(scope.getLibrary(), name);
-      if (existingElement != null) {
-        SourceInfo nameSourceInfo = element.getNameLocation();
-        if (existingElement.getKind() == ElementKind.LIBRARY_PREFIX) {
-          onError(nameSourceInfo, ResolverErrorCode.CANNOT_HIDE_IMPORT_PREFIX, name);
-        }
-      }
-    }
     // Check for duplicate declaration in the same scope.
     if (existingLocalElement != null && errorCode != null) {
       SourceInfo nameSourceInfo = element.getNameLocation();