Use StrictTypeChecking for ImageBitmap

Use StrictTypeChecking for ImageBitmap

Add [StrictTypeChecking] to the 'ImageBitmapFactories' interface and
the 'Window' partial interface. This doesn't change behavior in practice,
but signals that it has been considered.
Drop the unnecessary null-checks in the implementation.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171790

[Justin Novosad, 2014-04-16 17:01:30]

On 2014/04/16 09:04:38, fs wrote:

lgtm

[fs, 2014-04-16 17:20:58]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2014-04-16 17:21:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/fs@opera.com/240103002/1

[commit-bot: I haz the power, 2014-04-16 17:49:37]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-16 17:49:37]

Try jobs failed on following builders:
  tryserver.blink on blink_presubmit

[fs, 2014-04-16 17:50:12]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2014-04-16 17:50:23]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/fs@opera.com/240103002/1

[commit-bot: I haz the power, 2014-04-16 18:02:31]

Change committed as 171790