GitLab

Replace SetContentSetting method of the content_settings::Provider interface with GetWebsiteSetting.

This is part of a series of cleanup CLs to make all content settings Providers and the HostContentSetting map use only |Values| instead of |ContentSettings|. The HostContentSettingsMap should only contain conveniences methods that take |ContentSetting| parameters.

BUG=102637
TEST=HostContentSettingsMapTest*,
     PrefProviderTest*,
     PolicyProviderTest*,
     DefaultProviderTest*,
     ExtensionProviderTest*

Review URL: http://codereview.chromium.org/8539004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110500 0039d316-1c4b-4281-b951-d872f2087c98