Remove the compact nav flag and ensure it is always disabled. Note that the rest of the cnav code...

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 4288 matching lines @@
       </message>
       <message name="IDS_FLAGS_BLOCK_ALL_THIRD_PARTY_COOKIES_DESCRIPTION" desc="Description of the 'Block all third-party cookies' lab.">
         When the option to block third-party cookies from being set is enabled, also block third-party cookies from being read.
       </message>
       <message name="IDS_FLAGS_DISABLE_INTERACTIVE_FORM_VALIDATION_NAME" desc="Name of the 'Disable HTML5 interactive form validation' lab.">
         Disable HTML5 interactive form validation
       </message>
       <message name="IDS_FLAGS_DISABLE_INTERACTIVE_FORM_VALIDATION_DESCRIPTION" desc="Description of the 'Disable HTML5 interactive form validation' lab.">
         Disable showing validation messages and preventing form submission.
       </message>
-      <message name="IDS_FLAGS_ENABLE_COMPACT_NAVIGATION" desc="Name of the 'Compact Navigation' lab.">
-        Compact Navigation
-      </message>
-      <message name="IDS_FLAGS_ENABLE_COMPACT_NAVIGATION_DESCRIPTION" desc="Description of the 'Compact Navigation' lab.">
-        Adds a "Hide the toolbar" entry to the tabstrip's context menu. Use this to toggle between always displaying the toolbar (default) and only opening it as a drop down box as needed.
-      </message>
       <message name="IDS_COMPACT_NAVIGATION_BAR" desc="The menu item on the app menu to toggle compact navigation bar">
         Compact Navigation Bar
       </message>
       <message name="IDS_FLAGS_NEW_TAB_PAGE_4_NAME" desc="Name of the new tab page 4 lab.">
         Experimental new tab page
       </message>
       <message name="IDS_FLAGS_NEW_TAB_PAGE_4_DESCRIPTION" desc="Description of the new tab page 4 lab.">
         Enables an in-development redesign of the new tab page.
       </message>
       <message name="IDS_FLAGS_STATIC_IP_CONFIG_NAME" desc="Name of the static ip config lab.">
@@ skipping 8799 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>