Clear SDCH information on "Clear browsing data" path.

BUG=370567
BUG=327783
R=jar@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=277607

Review URL: https://codereview.chromium.org/321283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278297 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed