Navi: Update strings for background and sign-in modules

Bug: 964448
Change-Id: Ia44cae0803d49bf16c5df3bb945f0c8ea2841c49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617095
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660973}

chrome/app/onboarding_welcome_strings.grdp

@@ -47,8 +47,8 @@
   </message>
 
   <!-- NUX NTP background selection module -->
-  <message name="IDS_ONBOARDING_WELCOME_NTP_BACKGROUND_DESCRIPTION" desc="Description of what this section in the onboarding workflow does. This section lets a user change the wallpaper for their 'start page', which refers to the New Tab Page">
-    Pick a wallpaper for your start page
+  <message name="IDS_ONBOARDING_WELCOME_NTP_BACKGROUND_DESCRIPTION" desc="Description of what this section in the onboarding workflow does. This section lets a user change the background for the New Tab Page">
+    Pick a background
   </message>
   <message name="IDS_ONBOARDING_WELCOME_NTP_BACKGROUND_DEFAULT_TITLE" desc="Label for the default option when selecting a background. The default is to not have a background.">
     Default
@@ -108,7 +108,7 @@
 
   <!-- Sign-in view -->
   <message name="IDS_ONBOARDING_WELCOME_SIGNIN_VIEW_HEADER" desc="Header for the page that prompts user to sign in to chrome.">
-    Save your progress
+    Your Chrome, Everywhere
   </message>
   <message name="IDS_ONBOARDING_WELCOME_SIGNIN_VIEW_SUB_HEADER" desc="Sub-header for the page that prompts user to sign in to chrome.">
     Sign in and turn on sync to get your bookmarks, passwords and more on all devices