Delete TLS version fallback code in net/http.

net/log/net_log_event_type_list.h

 // Copyright (c) 2012 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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
 // directly into net_log.h. DO NOT include this file anywhere else.
 
 // In the event of a failure, a many end events will have a |net_error|
 // parameter with the integer error code associated with the failure.  Most
 // of these parameters are not individually documented.
@@ skipping 523 matching lines @@
 
 // An SSL connection needs to be retried with a lower protocol version because
 // the server may be intolerant of the protocol version we offered.
 // The following parameters are attached to the event:
 //   {
 //     "host_and_port": <String encoding the host and port>,
 //     "net_error": <Net integer error code>,
 //     "version_before": <SSL version before the fallback>,
 //     "version_after": <SSL version after the fallback>,
 //   }
+//
+// TODO(davidben): Remove this event and the corresponding log_view_painter.js
+// logic in M56.
 EVENT_TYPE(SSL_VERSION_FALLBACK)
 
 // An SSL connection needs to be retried with more cipher suites because the
 // server may require a deprecated cipher suite. The following parameters are
 // attached to the event:
 //   {
 //     "host_and_port": <String encoding the host and port>,
 //     "net_error": <Net integer error code>,
 //   }
 EVENT_TYPE(SSL_CIPHER_FALLBACK)
@@ skipping 2424 matching lines @@
 // The start/end of some portion of the SAFE_BROWSING_CHECKING_URL during which
 // the request is delayed due to that check.
 //
 // The BEGIN phase contains the following parameters:
 //  {
 //    "url": <The URL being checked>,
 //    "defer_reason" : < "at_start", "at_response", "redirect",
 //                       "resumed_redirect", "unchecked_redirect">
 //  }
 EVENT_TYPE(SAFE_BROWSING_DEFERRED)