Remove fallback mode and corresponding cli flag.

pkg/analyzer/lib/src/summary/summarize_elements.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library serialization.elements;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/api_signature.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/name_filter.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/summary/summarize_const_expr.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
-import 'package:path/path.dart' as path;
 
 /**
  * Serialize all the elements in [lib] to a summary using [ctx] as the context
  * for building the summary, and using [typeProvider] to find built-in types.
  */
 LibrarySerializationResult serializeLibrary(
     LibraryElement lib, TypeProvider typeProvider, bool strongMode) {
   _LibrarySerializer serializer =
       new _LibrarySerializer(lib, typeProvider, strongMode);
   LinkedLibraryBuilder linked = serializer.serializeLibrary();
@@ skipping 110 matching lines @@
   final bool _excludeHashes;
 
   /**
    * Create a [PackageBundleAssembler].  If [excludeHashes] is `true`, hash
    * computation will be skipped.
    */
   PackageBundleAssembler({bool excludeHashes: false})
       : _excludeHashes = excludeHashes,
         _unlinkedUnitHashes = excludeHashes ? null : <String>[];
 
-  /**
-   * Add a fallback library to the package bundle, corresponding to the library
-   * whose defining compilation unit is located at [source].  Caller must also
-   * call [addFallbackUnit] for all compilation units contained in the library
-   * (including the defining compilation unit).
-   */
-  void addFallbackLibrary(Source source) {
-    String uri = source.uri.toString();
-    _linkedLibraryUris.add(uri);
-    _linkedLibraries.add(new LinkedLibraryBuilder(fallbackMode: true));
-  }
-
-  /**
-   * Add a fallback compilation unit to the package bundle, corresponding to
-   * the compilation unit located at [source].
-   */
-  void addFallbackUnit(Source source) {
-    String uri = source.uri.toString();
-    UnlinkedUnitBuilder unit = new UnlinkedUnitBuilder(
-        fallbackModePath: path.relative(source.fullName));
-    _unlinkedUnitUris.add(uri);
-    _unlinkedUnits.add(unit);
-    _unlinkedUnitMap[uri] = unit;
-  }
-
   void addLinkedLibrary(String uri, LinkedLibraryBuilder library) {
     _linkedLibraries.add(library);
     _linkedLibraryUris.add(uri);
   }
 
   void addUnlinkedUnit(Source source, UnlinkedUnitBuilder unit) {
     addUnlinkedUnitWithHash(source.uri.toString(), unit,
         _excludeHashes ? null : _hash(source.contents.data));
   }
 
@@ skipping 1518 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }