MD Settings: implement "RESTART" button for hardware acceleration to take effect

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Policy Indicators -->
   <message name="IDS_SETTINGS_CONTROLLED_SETTING_EXTENSION" desc="Text displayed in the controlled settings indicator tooltip when a setting's value is enforced by an extension.">
     This setting is controlled by extension <ph name="NAME">$1<ex>Settings Extension</ex></ph>
   </message>
 
   <!-- Accessibility Page -->
   <message name="IDS_SETTINGS_ACCESSIBILITY" desc="Name of the settings page which displays accessibility preferences.">
@@ skipping 97 matching lines @@
   <!-- Common -->
   <message name="IDS_SETTINGS_ADVANCED" desc="Name of the settings page which displays advanced preferences.">
     Advanced
   </message>
   <message name="IDS_SETTINGS_BASIC" desc="Name of the settings page which displays advanced preferences.">
     Basic
   </message>
   <message name="IDS_SETTINGS_SETTINGS" desc="The settings page title.">
     Settings
   </message>
+  <if expr="not chromeos">
+    <message name="IDS_SETTINGS_RESTART" desc="Text for a button that will restart Chrome.">
+      Relaunch
+    </message>
+  </if>
+  <if expr="chromeos">
+    <message name="IDS_SETTINGS_RESTART" desc="Text for a button that will restart ChromeOS.">
+      Restart
+    </message>
+  </if>
 
   <!-- Passwords and Autofill Page -->
   <message name="IDS_SETTINGS_PASSWORDS_AND_AUTOFILL_PAGE_TITLE" desc="Name of the settings page which allows managing passwords and autofill settings.">
     Passwords and forms
   </message>
   <message name="IDS_SETTINGS_AUTOFILL" desc="Name for the autofill section and toggle.">
     Autofill settings
   </message>
   <message name="IDS_SETTINGS_AUTOFILL_DETAIL" desc="Description of what toggling the 'Autofill' setting does. Immediately underneath IDS_SETTINGS_AUTOFILL">
     Enable Autofill to fill out forms in a single click
@@ skipping 1018 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>