Rename analyzer_experimental to analyzer.

pkg/analyzer/lib/src/generated/source_io.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 library engine.source.io;
 import 'source.dart';
 import 'java_core.dart';
 import 'java_io.dart';
 import 'engine.dart' show AnalysisContext, AnalysisEngine;
 export 'source.dart';
 /**
  * Instances of the class `FileBasedSource` implement a source that represents a file.
@@ skipping 334 matching lines @@
     }
     return null;
   }
   Source resolveAbsolute(ContentCache contentCache, Uri uri) {
     if (!isFileUri(uri)) {
       return null;
     }
     return new FileBasedSource.con1(contentCache, new JavaFile.fromUri(uri));
   }
 }