Channel switcher dialog resets selected radio button on cancel.

BUG=321426
TEST=manual testing on Pixel.

Review URL: https://codereview.chromium.org/79543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236472 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236472
Cast: Adding pwestin and mikhal as owners.

Review URL: https://codereview.chromium.org/79583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236473 0039d316-1c4b-4281-b951-d872f2087c98
A rather small change following up on comments in issue 55953002.

BUG=309578

Review URL: https://codereview.chromium.org/79633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236474 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236473
SVN changes up to revision 236474