Make --enable-benchmarking not affect metrics recording.

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
@@ skipping 564 matching lines @@
 // Loads the Media Router component extension on startup.
 const char kLoadMediaRouterComponentExtension[] =
     "load-media-router-component-extension";
 
 // Makes Chrome default browser
 const char kMakeDefaultBrowser[]            = "make-default-browser";
 
 // Forces the maximum disk space to be used by the media cache, in bytes.
 const char kMediaCacheSize[]                = "media-cache-size";
 
-// Enables the recording of metrics reports but disables reporting. In contrast
-// to kDisableMetrics, this executes all the code that a normal client would
-// use for reporting, except the report is dropped rather than sent to the
-// server. This is useful for finding issues in the metrics code during UI and
-// performance tests.
-const char kMetricsRecordingOnly[]          = "metrics-recording-only";
-
 // Allows setting a different destination ID for connection-monitoring GCM
 // messages. Useful when running against a non-prod management server.
 const char kMonitoringDestinationID[]       = "monitoring-destination-id";
 
 // Sets the granularity of events to capture in the network log. The mode can be
 // set to one of the following values:
 //   "Default"
 //   "IncludeCookiesAndCredentials"
 //   "IncludeSocketBytes"
 //
@@ skipping 590 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches