Remove fileBrowserPrivate.transferFile.

tools/metrics/histograms/histograms.xml

 <!--
 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.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
@@ skipping 17110 matching lines @@
   <int value="331" label="EXTENSION_ISALLOWEDFILESCHEMEACCESS"/>
   <int value="332" label="EXPERIMENTAL_IDENTITY_LAUNCHWEBAUTHFLOW"/>
   <int value="333" label="FILEBROWSERPRIVATE_GETDRIVECONNECTIONSTATE"/>
   <int value="334" label="TABS_DETECTLANGUAGE"/>
   <int value="335" label="METRICSPRIVATE_RECORDVALUE"/>
   <int value="336" label="BOOKMARKMANAGERPRIVATE_SORTCHILDREN"/>
   <int value="337" label="SERIAL_READ"/>
   <int value="338" label="APP_CURRENTWINDOWINTERNAL_MAXIMIZE"/>
   <int value="339" label="EXPERIMENTAL_DISCOVERY_CLEARALLSUGGESTIONS"/>
   <int value="340" label="DELETED_MANAGEDMODEPRIVATE_ENTER"/>
-  <int value="341" label="FILEBROWSERPRIVATE_TRANSFERFILE"/>
+  <int value="341" label="DELETED_FILEBROWSERPRIVATE_TRANSFERFILE"/>

[satorux1, 2013/08/06 01:29:09]

I think you don't need to touch this. The comment above said:

<!-- Generated from ../../../chrome/browser/extensions/extension_function_histog
       ram_value.h -->

[hidehiko, 2013/08/06 01:41:45]

According to the change history, it seems we need to manually edit this?

   <int value="342" label="BROWSERACTION_SETPOPUP"/>
   <int value="343" label="TABS_GETSELECTED"/>
   <int value="344" label="FONTSETTINGS_GETFONT"/>
   <int value="345" label="BLUETOOTH_READ"/>
   <int value="346" label="WEBREQUESTINTERNAL_EVENTHANDLED"/>
   <int value="347" label="EVENTS_ADDRULES"/>
   <int value="348" label="CONTEXTMENUS_CREATE"/>
   <int value="349" label="MEDIAPLAYERPRIVATE_GETPLAYLIST"/>
   <int value="350" label="DOWNLOADS_ERASE"/>
   <int value="351" label="EXPERIMENTAL_RECORD_CAPTUREURLS"/>
@@ skipping 7197 matching lines @@
   <group name="Disabled" label="Neither extra webstore link is visible"/>
   <group name="FooterLink" label="Link in bottom right of footer"/>
   <group name="PlusIcon" label="Plus icon in apps page"/>
   <affected-histogram name="Extensions.AppLaunch"/>
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>