Eliminate dependencies on pkg/front_end.

pkg/analyzer/lib/src/codegen/tools.dart

Index: pkg/analyzer/lib/src/codegen/tools.dart
diff --git a/pkg/analyzer/lib/src/codegen/tools.dart b/pkg/analyzer/lib/src/codegen/tools.dart
index ff53db630540eb544030497dcdba56ec61e99d11..a12ac3541ddadac3db13f8e1a556823943910f03 100644
--- a/pkg/analyzer/lib/src/codegen/tools.dart
+++ b/pkg/analyzer/lib/src/codegen/tools.dart
@@ -10,6 +10,7 @@ library analyzer.src.codegen.tools;
 import 'package:analyzer/src/codegen/html.dart';
 import 'package:analyzer/src/codegen/text_formatter.dart';
 import 'package:html/dom.dart' as dom;
+export 'package:front_end/src/codegen/tools.dart';

[Siggi Cherem (dart-lang), 2017/08/07 16:57:10]

it seems like this file is not used anymore in pacakge:front_end, maybe it is
worth moving that code back here?

[Paul Berry, 2017/08/07 17:04:33]

Maybe.  I'd like to wait until we see how kernel's use of flatbuffers pans out
first.

 
 final RegExp trailingSpacesInLineRegExp = new RegExp(r' +$', multiLine: true);
 final RegExp trailingWhitespaceRegExp = new RegExp(r'[\n ]+$');