Ensure extensions and the Chrome Web Store are loaded in new BrowsingInstances.

BUG=174943
TEST=Can't post message to CWS.  See bug for repro steps.


Review URL: https://chromiumcodereview.appspot.com/12301013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@184208 0039d316-1c4b-4281-b951-d872f2087c98
bool ContentBrowserClient::AllowPepperSocketAPI(
    BrowserContext* browser_context,
    const GURL& url,
    const SocketPermissionRequest& params) {
  return false;
}

bool ContentBrowserClient::AllowPepperSocketAPI(
    BrowserContext* browser_context,
    const GURL& url,
    const SocketPermissionRequest& params) {
  return false;
}
