Revert 20127

tools/dom/templates/html/dart2js/impl_WorkerContext.darttemplate

Index: tools/dom/templates/html/dart2js/impl_WorkerContext.darttemplate
diff --git a/tools/dom/templates/html/dart2js/impl_WorkerContext.darttemplate b/tools/dom/templates/html/dart2js/impl_WorkerContext.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..27275bf5afa5af54c3201fc7521a6be186ba7ce7
--- /dev/null
+++ b/tools/dom/templates/html/dart2js/impl_WorkerContext.darttemplate
@@ -0,0 +1,24 @@
+// 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.
+
+part of $LIBRARYNAME;
+
+$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$!MEMBERS
+
+  /**
+   * Gets an instance of the Indexed DB factory to being using Indexed DB.
+   *
+   * Use [IdbFactory.supported] to check if Indexed DB is supported on the
+   * current platform.
+   */
+  @SupportedBrowser(SupportedBrowser.CHROME, '23.0')
+  @SupportedBrowser(SupportedBrowser.FIREFOX, '15.0')
+  @SupportedBrowser(SupportedBrowser.IE, '10.0')
+  @Experimental
+  IdbFactory get indexedDB =>
+      JS('IdbFactory',
+         '#.indexedDB || #.webkitIndexedDB || #.mozIndexedDB',
+         this, this, this);
+}