Switch Sdch3.AdvertisedWithSecureScheme histogram to use target_url.SchemeIsCryptographic().

SchemeIsSecure() is deprecated. Replacing it with SchemeIsCryptographic() in this case is safe because the check was effectively only checking for HTTP vs. HTTPS. (The UMA histogram values are even called "HTTP" and HTTPS"):

- Sdch3.AdvertisedWithSecureScheme is recorded in SdchManager::GetDictionarySet(),
- which is only called from URLRequestHttpJob::AddExtraHeaders(),
- which is only used for HTTP and HTTPS requests.

BUG=362214

Review URL: https://codereview.chromium.org/1294713004

Cr-Commit-Position: refs/heads/master@{#343801}
1 file changed