Build fix: rename dom.spawnDomIsolateImpl to spawnDomIsolate.

lib/dom/src/native_DOMPublic.dart

Index: lib/dom/src/native_DOMPublic.dart
diff --git a/lib/dom/src/native_DOMPublic.dart b/lib/dom/src/native_DOMPublic.dart
index 4487f74f0878b18c9c274c04f66769e28df15bc0..a5e0f2efdd8bed1ea61d206d6e11cf04a69a0f6a 100644
--- a/lib/dom/src/native_DOMPublic.dart
+++ b/lib/dom/src/native_DOMPublic.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // This API is exploratory.
-spawnDomIsolateImpl(Window targetWindow, String entryPoint) {
+spawnDomIsolate(Window targetWindow, String entryPoint) {
   if (targetWindow is! DOMWindowImplementation && targetWindow is! DOMWindowCrossFrameImplementation) {
     throw 'Bad window argument: $targetWindow';
   }