Making all DOM types abstract and removing superfluous Dartium constructors.

Making all DOM types abstract and removing superfluous Dartium constructors.

Adding factory constructors to all classes to suppress missing generative constructor warnings.

Adding a throw to Dartium's base DOM class to prevent construction of native objects.

This also includes the changes necessary to make all DOM types abstract, but I'm running into a dart2js issue which is preventing that.
BUG=
R=vsm@google.com

Committed: https://code.google.com/p/dart/source/detail?r=24241

[blois, 2013-06-19 23:16:19]

https://codereview.chromium.org/17063007/diff/2001/sdk/lib/html/dartium/nativ...
File sdk/lib/html/dartium/nativewrappers.dart (right):

https://codereview.chromium.org/17063007/diff/2001/sdk/lib/html/dartium/nativ...
sdk/lib/html/dartium/nativewrappers.dart:8: NativeFieldWrapperClass1() {
Does this need to be a default generative constructor, or can it be a private
factory constructor?

[vsm, 2013-06-20 15:19:00]

lgtm

https://codereview.chromium.org/17063007/diff/2001/sdk/lib/html/dartium/nativ...
File sdk/lib/html/dartium/nativewrappers.dart (right):

https://codereview.chromium.org/17063007/diff/2001/sdk/lib/html/dartium/nativ...
sdk/lib/html/dartium/nativewrappers.dart:8: NativeFieldWrapperClass1() {
On 2013/06/19 23:16:19, blois wrote:
> Does this need to be a default generative constructor, or can it be a private
> factory constructor?

Either should work.  We never should call the constructor on this type or its
subclasses.

[blois, 2013-06-20 17:32:08]

Committed patchset #1 manually as r24241 (presubmit successful).