cros: Update wallpaper picker network error string

TBR=cpu@chromium.org

Bug: b/110114882
Change-Id: I79e81cc4e02aedee55bb9d2e63d849eecb75e516
Reviewed-on: https://chromium-review.googlesource.com/1145790Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577016}

chrome/app/chromeos_strings.grdp

@@ -50,8 +50,8 @@
   <message name="IDS_WALLPAPER_MANAGER_ACCESS_FAIL" desc="The string displayed to user when access wallpaper server failed.">
     Chrome cannot access wallpapers. Please connect to a network.
   </message>
-  <message name="IDS_WALLPAPER_MANAGER_NETWORK_ERROR" desc="The string displayed to user when access wallpaper server failed on the new wallpaper picker.">
-    The images are currently not available. Please reconnect to view the collections.
+  <message name="IDS_WALLPAPER_MANAGER_NETWORK_ERROR" desc="The string displayed when user can't use wallpaper picker because they're not connected to the internet.">
+    The images are currently not available. Please reconnect to the internet to see wallpaper collections.
   </message>
   <message name="IDS_WALLPAPER_MANAGER_DOWNLOAD_FAIL" desc="The string displayed to user when downloading the wallpaper failed.">
     Chrome cannot download this wallpaper.