Revert "Handle (missing) trailing slash in dartdoc"

sdk/lib/_internal/compiler/compiler.dart

 // Copyright (c) 2012, 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('compiler');
 
 #import('dart:uri');
 #import('implementation/apiimpl.dart');
 
 // Unless explicitly allowed, passing [:null:] for any argument to the
@@ skipping 25 matching lines @@
  * the compilation fails, the future's value will be [:null:] and
  * [handler] will have been invoked at least once with [:kind ==
  * Diagnostic.ERROR:] or [:kind == Diagnostic.CRASH:].
  */
 Future<String> compile(Uri script,
                        Uri libraryRoot,
                        Uri packageRoot,
                        ReadStringFromUri provider,
                        DiagnosticHandler handler,
                        [List<String> options = const []]) {
-  if (!libraryRoot.path.endsWith("/")) {
-    throw new ArgumentError("libraryRoot must end with a /");
-  }
-  if (packageRoot != null && !packageRoot.path.endsWith("/")) {
-    throw new ArgumentError("packageRoot must end with a /");
-  }
   // TODO(ahe): Consider completing the future with an exception if
   // code is null.
   Compiler compiler = new Compiler(provider, handler, libraryRoot, packageRoot,
                                    options);
   compiler.run(script);
   String code = compiler.assembledCode;
   return new Future.immediate(code);
 }
 
 /**
@@ skipping 56 matching lines @@
   final String name;
 
   /**
    * This constructor is not private to support user-defined
    * diagnostic kinds.
    */
   const Diagnostic(this.ordinal, this.name);
 
   String toString() => name;
 }