[dart:html] rename register to registerElement per spec

tests/html/custom/document_register_basic_test.dart

 // Copyright (c) 2013, 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 document_register_basic_test;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:html';
 import '../utils.dart';
 
@@ skipping 29 matching lines @@
   factory BadE() => new Element.tag(tag);
 }
 
 main() {
   useHtmlConfiguration();
 
   // Adapted from Blink's fast/dom/custom/document-register-basic test.
 
   setUp(() => customElementsReady);
 
-  test('Testing document.register() basic behaviors', () {
-    document.register(Foo.tag, Foo);
+  test('Testing document.registerElement() basic behaviors', () {
+    document.registerElement(Foo.tag, Foo);
 
     // Cannot register an existing dart:html type.
-    expect(() => document.register('x-bad-a', HtmlElement), throws);
+    expect(() => document.registerElement('x-bad-a', HtmlElement), throws);
 
     // Invalid user type.  Doesn't inherit from HtmlElement.
-    expect(() => document.register('x-bad-b', BadB), throws);
+    expect(() => document.registerElement('x-bad-b', BadB), throws);
 
     // Not a type.
-    expect(() => document.register('x-bad-c', null), throws);
+    expect(() => document.registerElement('x-bad-c', null), throws);
 
     // Cannot register system type.
-    expect(() => document.register('x-bad-d', Object), throws);
+    expect(() => document.registerElement('x-bad-d', Object), throws);
 
     // Must extend HtmlElement, not just implement it.
-    expect(() => document.register(BadE.tag, BadE), throws);
+    expect(() => document.registerElement(BadE.tag, BadE), throws);
 
     // Constructor initiated instantiation
     var createdFoo = new Foo();
     expect(createdFoo.thisIsACustomClass, isTrue);
 
     // Dart type correctness
     expect(createdFoo is HtmlElement, isTrue);
     expect(createdFoo is Foo, isTrue);
     expect(createdFoo.runtimeType, Foo);
 
@@ skipping 20 matching lines @@
     expect(parsedFoo is Foo, isTrue);
     expect(parsedFoo.tagName, "X-FOO");
 
     // Ensuring the wrapper is retained
     var someProperty = new Expando();
     someProperty[parsedFoo] = "hello";
     expect(container.firstChild, parsedFoo);
     expect(someProperty[container.firstChild], someProperty[parsedFoo]);
 
     // Having another constructor
-    document.register(Bar.tag, Bar);
+    document.registerElement(Bar.tag, Bar);
     var createdBar = new Bar();
     expect(createdBar is Bar, isTrue);
     expect(createdBar is Foo, isFalse);
     expect(createdBar.tagName, "X-BAR");
 
     // Having a subclass
-    document.register(Baz.tag, Baz);
+    document.registerElement(Baz.tag, Baz);
     var createdBaz = new Baz();
     expect(createdBaz.tagName, "X-BAZ");
     expect(createdBaz.thisIsACustomClass, isTrue);
     expect(createdBaz.thisIsAlsoACustomClass, isTrue);
 
     // With irregular cases
     var createdUpperBar = new Element.tag("X-BAR");
     var createdMixedBar = new Element.tag("X-Bar");
     expect(createdUpperBar is Bar, isTrue);
     expect(createdUpperBar.tagName, "X-BAR");
     expect(createdMixedBar is Bar, isTrue);
     expect(createdMixedBar.tagName, "X-BAR");
 
     container.setInnerHtml("<X-BAR></X-BAR><X-Bar></X-Bar>",
         treeSanitizer: new NullTreeSanitizer());
     upgradeCustomElements(container);
     expect(container.firstChild is Bar, isTrue);
     expect(container.firstChild.tagName, "X-BAR");
     expect(container.lastChild is Bar, isTrue);
     expect(container.lastChild.tagName, "X-BAR");
 
     // Constructors shouldn't interfere with each other
     expect((new Foo()).tagName, "X-FOO");
     expect((new Bar()).tagName, "X-BAR");
     expect((new Baz()).tagName, "X-BAZ");
   });
 }