Remove SourceContainer, Source_ContentReceiver.

Change-Id: I6e801382605d412f1f24d09ee58009c249439d46
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/122300
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

Author: scheglov

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

@@ -445,38 +445,6 @@ abstract class Source implements AnalysisTarget {
   bool exists();
 }
 
-/**
- * The interface `ContentReceiver` defines the behavior of objects that can receive the
- * content of a source.
- */
-abstract class Source_ContentReceiver {
-  /**
-   * Accept the contents of a source.
-   *
-   * @param contents the contents of the source
-   * @param modificationTime the time at which the contents were last set
-   */
-  void accept(String contents, int modificationTime);
-}
-
-/**
- * The interface `SourceContainer` is used by clients to define a collection of sources
- *
- * Source containers are not used within analysis engine, but can be used by clients to group
- * sources for the purposes of accessing composite dependency information. For example, the Eclipse
- * client uses source containers to represent Eclipse projects, which allows it to easily compute
- * project-level dependencies.
- */
-abstract class SourceContainer {
-  /**
-   * Determine if the specified source is part of the receiver's collection of sources.
-   *
-   * @param source the source in question
-   * @return `true` if the receiver contains the source, else `false`
-   */
-  bool contains(Source source);
-}
-
 /**
  * Instances of the class `SourceFactory` resolve possibly relative URI's against an existing
  * [Source].

pkg/analyzer/test/generated/resolver_test.dart

@@ -13,7 +13,6 @@ import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/resolver.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/testing/ast_test_factory.dart';
 import 'package:analyzer/src/generated/testing/element_factory.dart';
 import 'package:test/test.dart';
@@ -462,11 +461,6 @@ class ScopeTest extends DriverResolutionTest {
   }
 }
 
-class SourceContainer_ChangeSetTest_test_toString implements SourceContainer {
-  @override
-  bool contains(Source source) => false;
-}
-
 /**
  * Instances of the class `StaticTypeVerifier` verify that all of the nodes in an AST
  * structure that should have a static type associated with them do have a static type.

pkg/analyzer/test/generated/test_support.dart

@@ -432,9 +432,6 @@ class TestSource extends Source {
   }
 
   bool exists() => exists2;
-  void getContentsToReceiver(Source_ContentReceiver receiver) {
-    throw new UnsupportedError('getContentsToReceiver');
-  }
 
   Source resolve(String uri) {
     throw new UnsupportedError('resolve');