Changed new tab content for Guest Session.

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 56ec016a341b96a48b9e163241492e1cd20e891e..0dd5294fa5775fcfec848222b8fab18c4d09ccfc 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7170,6 +7170,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Because <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> does not control how extensions handle your personal data, all extensions have been disabled for incognito windows. You can reenable them individually in the
         <ph name="BEGIN_LINK">&lt;a href="$2"&gt;</ph>extensions manager<ph name="END_LINK">&lt;/a&gt;</ph>.
       </message>
+      <message name="IDS_NEW_TAB_GUEST_SESSION_MESSAGE"
+          desc="Used when a person enters Guest Session">
+          <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>You're browsing as a guest<ph name="END_BOLD">&lt;/strong&gt;</ph>. Pages you view in this window won't appear in the browser history or search history, and they won't leave other traces, like cookies, on the computer after you sign out. Files you download and bookmarks you create won't be preserved.
+        <ph name="LINE_BREAK">&lt;br /&gt;&lt;br /&gt;</ph>
+        <ph name="BEGIN_LINK">&lt;a href="$1"&gt;</ph>Learn more<ph name="END_LINK">&lt;/a&gt;</ph> about guest mode.
+      </message>
       <message name="IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW_SINGLE"
                desc="Title of recently closed windows in the recently closed section of the new tab page when the window has a single tab">
         1 Tab