Implement restart-required message on Linux.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 5feec59a3ca01e9ee7f52b99c25f0dbac12c5332..80f144f3a50c403d8111c0dc104f4e54358e5340 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7182,6 +7182,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_PLUGIN_PREFER_HTML_BY_DEFAULT" desc="The placeholder text for a plugin with no fallback content when Prefer HTML5 By Default is on.">
         Click to enable <ph name="PLUGIN_NAME">$1<ex>Flash</ex></ph>.
       </message>
+      <message name="IDS_PLUGIN_RESTART_REQUIRED" desc="The placeholder text for a plugin that can't be loaded until the browser is restarted.">
+        Restart <ph name="ACCNAME_APP">$1<ex>Chrome</ex></ph> to enable <ph name="PLUGIN_NAME">$2<ex>Flash</ex></ph>
+      </message>
 
       <!-- Session Crashed Info Bar/Bubble-->
       <message name="IDS_SESSION_CRASHED_BUBBLE_TITLE" desc="Title of the session crashed bubble view.">