Unframe chrome://extensions as it's the last (and only) uber item

chrome/browser/browser_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
   <outputs>
     <output filename="grit/browser_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="browser_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <structures>
       <if expr="enable_app_list">
         <structure name="IDR_APP_LIST_START_PAGE_CSS" file="resources\app_list\start_page.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_HTML" file="resources\app_list\start_page.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_JS" file="resources\app_list\start_page.js" flattenhtml="true" type="chrome_html" />
       </if>
       <if expr="enable_extensions">
         <structure name="IDR_EXTENSIONS_HTML" file="resources\extensions\extensions.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_MD_EXTENSIONS_EXTENSIONS_HTML" file="resources\md_extensions\extensions.html" flattenhtml="true" allowexternalscript="true" type="chrome_html" />
       </if>
       <if expr="chromeos">
         <structure name="IDR_FIRST_RUN_HTML" file="resources\chromeos\first_run\first_run.html" flattenhtml="true" type="chrome_html"/>
         <structure name="IDR_FIRST_RUN_JS" file="resources\chromeos\first_run\first_run.js" flattenhtml="true" type="chrome_html" />
-      </if>
-      <if expr="not is_android">
         <structure name="IDR_HELP_CSS" file="resources\help\help.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_HTML" file="resources\help\help.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_CONTENT_CSS" file="resources\help\help_content.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_CONTENT_HTML" file="resources\help\help_content.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_PAGE_HTML" file="resources\help\help_page.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_CHANNEL_CHANGE_PAGE_CSS" file="resources\help\channel_change_page.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_HELP_CHANNEL_CHANGE_PAGE_HTML" file="resources\help\channel_change_page.html" flattenhtml="true" type="chrome_html" />
+      </if>
+      <if expr="not is_android">
         <structure name="IDR_INCOGNITO_TAB_HTML" file="resources\ntp4\incognito_tab.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_MD_INCOGNITO_TAB_HTML" file="resources\ntp4\md_incognito_tab.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_GUEST_TAB_HTML" file="resources\ntp4\guest_tab.html" flattenhtml="true" type="chrome_html" />
       </if>
       <if expr="chromeos">
         <structure name="IDR_LOCK_HTML" file="resources\chromeos\login\lock.html" flattenhtml="true" type="chrome_html" variables="OOBE=lock" expand_variables="true"/>
         <structure name="IDR_LOCK_JS" file="resources\chromeos\login\lock.js" flattenhtml="true" type="chrome_html" variables="OOBE=lock" expand_variables="true" />
         <structure name="IDR_MD_LOCK_HTML" file="resources\chromeos\login\md_lock.html" flattenhtml="true" type="chrome_html" variables="OOBE=md_lock" expand_variables="true"/>
         <structure name="IDR_MD_LOCK_JS" file="resources\chromeos\login\md_lock.js" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_LOGIN_HTML" file="resources\chromeos\login\login.html" flattenhtml="true" type="chrome_html" variables="OOBE=login" expand_variables="true"/>
@@ skipping 199 matching lines @@
       <include name="IDR_SUPERVISED_USER_INTERNALS_CSS" file="resources\supervised_user_internals.css" compress="gzip" type="BINDATA" />
       <include name="IDR_SUPERVISED_USER_INTERNALS_JS" file="resources\supervised_user_internals.js" compress="gzip" type="BINDATA" />
       <if expr="enable_hangout_services_extension">
         <!-- Hangout Services extension, included in Google Chrome builds only. -->
         <include name="IDR_HANGOUT_SERVICES_MANIFEST" file="resources\hangout_services\manifest.json" type="BINDATA" />
       </if>
       <if expr="enable_hotwording">
         <include name="IDR_HOTWORD_MANIFEST" file="resources\hotword\manifest.json" type="BINDATA" />
         <include name="IDR_HOTWORD_AUDIO_VERIFICATION_MANIFEST" file="resources\hotword_audio_verification\manifest.json" type="BINDATA" />
       </if>
-      <if expr="not is_android">
+      <if expr="chromeos">
         <include name="IDR_HELP_JS" file="resources\help\help.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_HELP_PAGE_JS" file="resources\help\help_page.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_CHANNEL_CHANGE_PAGE_JS" file="resources\help\channel_change_page.js" flattenhtml="true" type="BINDATA" />
       </if>
 
       <if expr="not is_android and not is_ios">
         <!-- MD Bookmarks. -->
         <if expr="use_vulcanize">
           <then>
             <include name="IDR_MD_BOOKMARKS_VULCANIZED_HTML" file="${root_gen_dir}\chrome\browser\resources\md_bookmarks\vulcanized.html" use_base_dir="false" flattenhtml="true" allowexternalscript="true" type="BINDATA" compress="gzip" />
@@ skipping 192 matching lines @@
       <include name="IDR_SITE_ENGAGEMENT_JS" file="resources\engagement\site_engagement.js" flattenhtml="true" type="BINDATA" compress="gzip" />
       <include name="IDR_SITE_ENGAGEMENT_MOJO_JS" file="${root_gen_dir}\chrome\browser\engagement\site_engagement_details.mojom.js" use_base_dir="false" type="BINDATA" compress="gzip" />
       <include name="IDR_URL_MOJO_JS" file="${root_gen_dir}\url\mojo\url.mojom.js" use_base_dir="false" type="BINDATA" compress="gzip" />
       <include name="IDR_SYNC_CONFIRMATION_CSS" file="resources\signin\sync_confirmation\sync_confirmation.css" type="BINDATA" />
       <include name="IDR_SYNC_CONFIRMATION_HTML" file="resources\signin\sync_confirmation\sync_confirmation.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
       <include name="IDR_SYNC_CONFIRMATION_JS" file="resources\signin\sync_confirmation\sync_confirmation.js" type="BINDATA" />
       <include name="IDR_SIGNIN_EMAIL_CONFIRMATION_HTML" file="resources\signin\signin_email_confirmation\signin_email_confirmation.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
       <include name="IDR_SIGNIN_EMAIL_CONFIRMATION_JS" file="resources\signin\signin_email_confirmation\signin_email_confirmation.js" type="BINDATA" />
       <include name="IDR_SIGNIN_ERROR_HTML" file="resources\signin\signin_error\signin_error.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
       <include name="IDR_SIGNIN_ERROR_JS" file="resources\signin\signin_error\signin_error.js" type="BINDATA" />
-      <include name="IDR_UBER_HTML" file="resources\uber\uber.html" flattenhtml="true" type="BINDATA" />
-      <include name="IDR_UBER_JS" file="resources\uber\uber.js" type="BINDATA" />
-      <include name="IDR_UBER_FRAME_HTML" file="resources\uber\uber_frame.html" flattenhtml="true" type="BINDATA" />
-      <include name="IDR_UBER_FRAME_JS" file="resources\uber\uber_frame.js" flattenhtml="true" type="BINDATA" />
-      <include name="IDR_UBER_UTILS_JS" file="resources\uber\uber_utils.js" type="BINDATA" />
+      <if expr="chromeos">
+        <include name="IDR_UBER_HTML" file="resources\uber\uber.html" flattenhtml="true" type="BINDATA" />
+        <include name="IDR_UBER_JS" file="resources\uber\uber.js" type="BINDATA" />
+        <include name="IDR_UBER_FRAME_HTML" file="resources\uber\uber_frame.html" flattenhtml="true" type="BINDATA" />
+        <include name="IDR_UBER_FRAME_JS" file="resources\uber\uber_frame.js" flattenhtml="true" type="BINDATA" />
+        <include name="IDR_UBER_UTILS_JS" file="resources\uber\uber_utils.js" type="BINDATA" />
+      </if>
       <include name="IDR_USB_INTERNALS_CSS" file="resources\usb_internals\usb_internals.css" type="BINDATA" compress="gzip" />
       <include name="IDR_USB_INTERNALS_HTML" file="resources\usb_internals\usb_internals.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" compress="gzip" />
       <include name="IDR_USB_INTERNALS_JS" file="resources\usb_internals\usb_internals.js" type="BINDATA" compress="gzip" />
       <include name="IDR_USB_INTERNALS_MOJO_JS" file="${root_gen_dir}\chrome\browser\ui\webui\usb_internals\usb_internals.mojom.js" use_base_dir="false" type="BINDATA" compress="gzip" />
       <include name="IDR_USER_ACTIONS_HTML" file="resources\user_actions\user_actions.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
       <include name="IDR_USER_ACTIONS_CSS" file="resources\user_actions\user_actions.css" type="BINDATA" />
       <include name="IDR_USER_ACTIONS_JS" file="resources\user_actions\user_actions.js" type="BINDATA" />
       <if expr="enable_webrtc">
         <include name="IDR_WEBRTC_LOGS_HTML" file="resources\media\webrtc_logs.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
         <include name="IDR_WEBRTC_LOGS_JS" file="resources\media\webrtc_logs.js" type="BINDATA" />
@@ skipping 184 matching lines @@
       <if expr="not is_android and not is_ios">
         <include name="IDR_SSL_ERROR_ASSISTANT_PB" file="${root_gen_dir}/chrome/browser/resources/ssl/ssl_error_assistant/ssl_error_assistant.pb" use_base_dir="false" type="BINDATA" />
       </if>
       <if expr="is_android or is_linux">
         <include name="IDR_SANDBOX_INTERNALS_HTML" file="resources\sandbox_internals\sandbox_internals.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" compress="gzip" />
         <include name="IDR_SANDBOX_INTERNALS_JS" file="resources\sandbox_internals\sandbox_internals.js" type="BINDATA" compress="gzip" />
       </if>
     </includes>
   </release>
 </grit>