Update user agent version for iOS10.

ios/web/public/user_agent.mm

 // Copyright 2014 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.
 
 #include "ios/web/public/user_agent.h"
 
 #import <UIKit/UIKit.h>
 
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 14 matching lines @@
   const char* webkit_version_string;
 };
 
 struct OSVersionMap {
   int32_t major_os_version;
   int32_t minor_os_version;
   UAVersions ua_versions;
 };
 
 const UAVersions& GetUAVersionsForCurrentOS() {
   // The WebKit version can be extracted dynamically from UIWebView, but the

[justincohen, 2016/09/01 11:53:55]

eugenebut@ is this comment still true, especially re: UIWebView?

[Eugene But (OOO till 7-30), 2016/09/01 15:56:54]

I don't know how WebKit version extraction worked with UIWebView.

   // Safari version can't be, so a lookup table is used instead (for both, since
   // the reported versions should stay in sync).
   static const OSVersionMap version_map[] = {
+      {10, 0, {"602.1", "602.1.50"}},
       {9, 0, {"601.1.46", "601.1"}},
       {8, 0, {"600.1.4", "600.1.4"}},
       {7, 1, {"9537.53", "537.51.2"}},
       {7, 0, {"9537.53", "537.51.1"}},
   };
 
   int32_t os_major_version = 0;
   int32_t os_minor_version = 0;
   int32_t os_bugfix_version = 0;
   base::SysInfo::OperatingSystemVersionNumbers(&os_major_version,
@@ skipping 75 matching lines @@
                       BuildOSCpuInfo().c_str(),
                       ua_versions.webkit_version_string,
                       product.c_str(),
                       kernel_version,
                       ua_versions.safari_version_string);
 
   return user_agent;
 }
 
 }  // namespace web