Mark plugin requires restart code/resources Linux-only.

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 If you update this file, be sure also to update google_chrome_strings.grd. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
@@ skipping 1165 matching lines @@
       <message name="IDS_FEEDBACK_SERVICE_DIALOG_EXPLANATION_SCOUT" desc="Explanation of the dialog asking whether the user wants to upload some system information and page content for Safe Browsing analysis">
         You can help make Chromium safer and easier to use by automatically sending some system information and page content to Google to help detect dangerous apps and sites.
       </message>
 
       <!-- Desktop Capture -->
       <message name="IDS_DESKTOP_MEDIA_PICKER_SOURCE_TYPE_TAB" desc="Text for the button on the window picker dialog, clicking which takes one to tab sharing">
         Chromium Tab
       </message>
 
       <!-- Plugin Placeholders -->
-      <message name="IDS_PLUGIN_RESTART_REQUIRED" desc="The placeholder text for a plugin that can't be loaded until the browser is restarted.">
-        Restart Chromium to enable <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph>
-      </message>
+      <if expr="is_linux">
+        <message name="IDS_PLUGIN_RESTART_REQUIRED" desc="The placeholder text for a plugin that can't be loaded until the browser is restarted.">
+          Restart Chromium to enable <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph>
+        </message>
+      </if>
 
       <!-- Desktop to iOS promotion -->
       <message name="IDS_PASSWORD_MANAGER_DESKTOP_TO_IOS_PROMO_TEXT" desc="Text for Chrome iOS Promotion appearing in the password bubble after a password is saved.">
         Install Chromium on your phone. We’ll send an SMS to your phone.
       </message>
       <message name="IDS_PASSWORD_MANAGER_DESKTOP_TO_IOS_PROMO_TEXT_WITH_PHONE_NUMBER" desc="Text for Chrome iOS Promotion appearing in the password bubble after a password is saved.">
         Install Chromium on your phone. We’ll send an SMS to your phone: <ph name="PHONE_NUMBER">$1<ex>(650) 123-4567</ex></ph>
       </message>
       <message name="IDS_PASSWORD_MANAGER_DESKTOP_TO_IOS_PROMO_TEXT_V2" desc="Text for Chrome iOS Promotion appearing in the password bubble after a password is saved, this one mentioning explicitly that the SMS will be sent to the recovery phone number.">
         Install Chromium on your phone. We’ll send an SMS to your account recovery phone number.
@@ skipping 76 matching lines @@
         <message name="IDS_WIN10_WELCOME_PIN_SUBHEADING" desc="A subheading on a section which gives instructions on how to pin Chromium to the Windows 10 taskbar.">
           Pin Chromium to your taskbar
         </message>
         <message name="IDS_WIN10_WELCOME_SELECT" desc="An instruction asking the user to select Chromium from an external list of apps.">
           Select <ph name="SMALL_PRODUCT_LOGO">&lt;div class="logo-small"&gt;&lt;/div&gt;</ph> <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>Chromium<ph name="END_BOLD">&lt;/strong&gt;</ph>
         </message>
       </if>
     </messages>
   </release>
 </grit>