Simplify the user agent code some more since after r255534 it's not affected by the site's URL.

components/autofill/content/browser/risk/fingerprint.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Generates fingerprints appropriate for sending to the Google Wallet Risk
 // engine, which is the fraud-detection engine used for purchases powered by
 // Google Wallet.  A fingerprint encapsulates machine and user characteristics.
 // Because much of the data is privacy-sensitive, fingerprints should only be
 // generated with explicit user consent, including consent to gather geolocation
 // data.
@@ skipping 41 matching lines @@
 // |install_time| is the absolute time of installation.
 void GetFingerprint(
     uint64 obfuscated_gaia_id,
     const gfx::Rect& window_bounds,
     const content::WebContents& web_contents,
     const std::string& version,
     const std::string& charset,
     const std::string& accept_languages,
     const base::Time& install_time,
     const std::string& app_locale,
+    const std::string& user_agent,
     const base::Callback<void(scoped_ptr<Fingerprint>)>& callback);
 
 }  // namespace risk
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_BROWSER_RISK_FINGERPRINT_H_