Remove deprecated_internalProblem.

pkg/front_end/lib/src/fasta/source/source_library_builder.dart

 // Copyright (c) 2016, 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 fasta.source_library_builder;
 
-import 'package:front_end/src/scanner/token.dart' show Token;
-
 import 'package:kernel/ast.dart' show ProcedureKind;
 
 import '../../base/resolve_relative_uri.dart' show resolveRelativeUri;
 
-import '../combinator.dart' show Combinator;
-
-import '../deprecated_problems.dart'
-    show deprecated_inputError, deprecated_internalProblem;
-
-import '../export.dart' show Export;
-
-import '../import.dart' show Import;
-
-import 'source_loader.dart' show SourceLoader;
+import '../../scanner/token.dart' show Token;
 
 import '../builder/builder.dart'
     show
         Builder,
         ClassBuilder,
         ConstructorReferenceBuilder,
         FormalParameterBuilder,
         FunctionTypeBuilder,
         LibraryBuilder,
         MemberBuilder,
         MetadataBuilder,
         NamedTypeBuilder,
         PrefixBuilder,
         ProcedureBuilder,
         Scope,
         TypeBuilder,
         TypeDeclarationBuilder,
         TypeVariableBuilder,
         Unhandled;
 
+import '../combinator.dart' show Combinator;
+
+import '../deprecated_problems.dart' show deprecated_inputError;
+
+import '../export.dart' show Export;
+
+import '../import.dart' show Import;
+
+import '../problems.dart' show unhandled;
+
+import 'source_loader.dart' show SourceLoader;
+
 abstract class SourceLibraryBuilder<T extends TypeBuilder, R>
     extends LibraryBuilder<T, R> {
   final SourceLoader loader;
 
   final DeclarationBuilder<T> libraryDeclaration;
 
   final List<ConstructorReferenceBuilder> constructorReferences =
       <ConstructorReferenceBuilder>[];
 
   final List<SourceLibraryBuilder<T, R>> parts = <SourceLibraryBuilder<T, R>>[];
@@ skipping 223 matching lines @@
     // implementation of MemberBuilder.isTopLevel to test explicitly for a
     // LibraryBuilder.
     if (currentDeclaration == libraryDeclaration) {
       if (builder is MemberBuilder) {
         builder.parent = this;
       } else if (builder is TypeDeclarationBuilder) {
         builder.parent = this;
       } else if (builder is PrefixBuilder) {
         assert(builder.parent == this);
       } else {
-        return deprecated_internalProblem("Unhandled: ${builder.runtimeType}");
+        return unhandled(
+            "${builder.runtimeType}", "addBuilder", charOffset, fileUri);
       }
     } else {
       assert(currentDeclaration.parent == libraryDeclaration);
     }
     bool isConstructor = builder is ProcedureBuilder &&
         (builder.isConstructor || builder.isFactory);
     Map<String, Builder> members = isConstructor
         ? currentDeclaration.constructors
         : (builder.isSetter
             ? currentDeclaration.setters
@@ skipping 335 matching lines @@
   /// synthesize type variables on the factory matching the class'.
   void addFactoryDeclaration(
       ProcedureBuilder procedure, DeclarationBuilder<T> factoryDeclaration) {
     factoryDeclarations[procedure] = factoryDeclaration;
   }
 
   Scope toScope(Scope parent) {
     return new Scope(members, setters, parent, isModifiable: false);
   }
 }