Deflake AutofillPopup test.

BUG=311849
NOTRY=true

Review URL: https://codereview.chromium.org/108423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240114 0039d316-1c4b-4281-b951-d872f2087c98
Remove kEnableResourceContentSettings and all the code that uses it since it's been behind a flag for years and isn't used.

BUG=39252
R=bauerb@chromium.org

Review URL: https://codereview.chromium.org/106713004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240115 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240115