Don't retain reference to ChromeGeolocationPermissionContext

ChromeGeolocationPermissionContext owns
GeolocationInfoBarQueueController, so make sure that the callback
passed to GeolocationInfoBarQueueController doesn't increase the
reference count on ChromeGeolocationPermissionContext (which 
https://chromiumcodereview.appspot.com/11072012 accidentally does).

TBR=bulach

BUG=152921
TEST=unittest:chrome_geolocation_permission_context on memory.fyi bot

Review URL: https://chromiumcodereview.appspot.com/11087030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160881 0039d316-1c4b-4281-b951-d872f2087c98
ChromeGeolocationPermissionContext::~ChromeGeolocationPermissionContext() {
}

ChromeGeolocationPermissionContext::~ChromeGeolocationPermissionContext() {
}
