Remove some Blink-sided left-overs of the old Web Notification code.

BUG=398045

Review URL: https://codereview.chromium.org/431483004

git-svn-id: svn://svn.chromium.org/blink/trunk@179811 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Minor cleanups in the web/ Notification files.

BUG=None
TEST=None
R=peter@chromium.org,tkent@chromium.org

Review URL: https://codereview.chromium.org/456563002

git-svn-id: svn://svn.chromium.org/blink/trunk@179812 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Credential Manager: Stub out CredentialsContainer notification methods.

They do basic type-checking of arguments, nothing more. Nothing to see here.

BUG=400674

Review URL: https://codereview.chromium.org/444413005

git-svn-id: svn://svn.chromium.org/blink/trunk@179813 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Remove unused Input domain methods and add a test for new one.

BUG=384522

Review URL: https://codereview.chromium.org/447263002

git-svn-id: svn://svn.chromium.org/blink/trunk@179814 bbb929c8-8fbe-4397-9dbb-9b2b20218538