DevTools: patch browser's Chrome version into Chrome user agents for emulation

third_party/WebKit/Source/devtools/front_end/common/BrowserVersionInfo.js

+// Copyright 2016 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.
+
+WebInspector.BrowserVersionInfo = {
+    /**
+     * @param {string} string
+     * @return {string}
+     */
+    patchStringWithCurrentVersion: function(string)
+    {
+        if (string.indexOf("%s") === -1)
+            return string;
+
+        var currentVersion = WebInspector.BrowserVersionInfo.Version;
+        console.assert(string.indexOf("%s") === string.lastIndexOf("%s"), "User agent string contains multiple %s");
+        return String.sprintf(string, currentVersion);
+    }
+};