Update Custom Elements API to new names.

LayoutTests/fast/dom/custom/element-upgrade.html

Index: LayoutTests/fast/dom/custom/element-upgrade.html
diff --git a/LayoutTests/fast/dom/custom/element-upgrade.html b/LayoutTests/fast/dom/custom/element-upgrade.html
index 19775d0c2e493d34508b3d661b3ebe10e773ee81..73b10e5e827447634f77036d7b926f54d159e002 100644
--- a/LayoutTests/fast/dom/custom/element-upgrade.html
+++ b/LayoutTests/fast/dom/custom/element-upgrade.html
@@ -14,7 +14,7 @@ description('Tests the element upgrade algorithm.');
 // time; custom element does not have a created callback.
 var host = document.createElement('div');
 host.innerHTML = '<x-a></x-a>';  // Using innerHTML avoids wrapping x-a
-var A = document.register('x-a', {prototype: Object.create(HTMLElement.prototype)});
+var A = document.registerElement('x-a', {prototype: Object.create(HTMLElement.prototype)});
 shouldBeTrue('host.firstChild instanceof A');
 
 // Scenario B: Type extension; upgrade candidate is in the document;
@@ -26,14 +26,14 @@ var callCount = 0;
 proto.createdCallback = function () {
   callCount++;
 };
-var B = document.register('x-b', {extends: 'span', prototype: proto});
+var B = document.registerElement('x-b', {extends: 'span', prototype: proto});
 shouldBeTrue('element instanceof B');
 shouldBe('callCount', '1');
 
 // Scenario C: The candidate is a custom tag but the definition is a
 // type extension. Upgrade should not happen.
 element = document.createElement('x-c');
-var C = document.register('x-c', {extends: 'span', prototype: Object.create(HTMLSpanElement.prototype)});
+var C = document.registerElement('x-c', {extends: 'span', prototype: Object.create(HTMLSpanElement.prototype)});
 shouldBeFalse('element instanceof C');
 shouldBe('Object.getPrototypeOf(element)', 'HTMLElement.prototype');
 
@@ -41,7 +41,7 @@ shouldBe('Object.getPrototypeOf(element)', 'HTMLElement.prototype');
 // extends a different tag. Upgrade should not happen.
 document.body.appendChild(host);
 host.innerHTML = '<span is="x-d"></span>';
-var D = document.register('x-d', {extends: 'div', prototype: Object.create(HTMLDivElement.prototype)});
+var D = document.registerElement('x-d', {extends: 'div', prototype: Object.create(HTMLDivElement.prototype)});
 shouldBeFalse('host.firstChild instanceof D');
 shouldBe('document.querySelector(":unresolved")', 'host.firstChild');
 
@@ -51,7 +51,7 @@ host.innerHTML = '<x-e id="e1"><x-e id="e2"></x-e></x-e><x-e id="e3"></x-e><x-e
 var upgradedOrder = [];
 var protoE = Object.create(HTMLElement.prototype);
 protoE.createdCallback = function() { upgradedOrder.push(this.id); };
-document.register('x-e', {prototype: protoE});
+document.registerElement('x-e', {prototype: protoE});
 shouldBe('upgradedOrder', '["e1","e2","e3","e4","e5"]');
 
 successfullyParsed = true;