Cleanup: Use WebDOMFileSystem methods instead of WebFrame ones

WebFrame::createFileSystem is going to be deprecated in favor of
more specialized WebDOMFileSystem methods.

BUG=none
TEST=no behavioral changes

Review URL: https://codereview.chromium.org/178493004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253492 0039d316-1c4b-4281-b951-d872f2087c98
[Hotword] Adding ability to reload the hotword extension to the hotword service for use when there is an error with the extension.

BUG=345804

Review URL: https://codereview.chromium.org/169613006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253493 0039d316-1c4b-4281-b951-d872f2087c98
Spoken feedback sounds for user photo capture/discard at image picker screen added. Also added accessibility message for flip-state announce.

Image-picker available on oobe flow, in chrome://settings change-picture option, supervised user creation.

For in-settings screen default images titles added for spoken feedback.

Small css fixes:
Tabbing to flip-photo button restricted for non-camera images.
Image frame for camera-flow case set same as for stable images.

BUG=166651,155196,343065

Review URL: https://codereview.chromium.org/158953002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253494 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253494