[NTP] Add custom link error notification strings

Added error strings for edit and delete custom links.

Bug: 877290
Change-Id: I6bee0b8804f34cf4760338c4b02ad440c2b4eb9f
Reviewed-on: https://chromium-review.googlesource.com/1188600
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586686}

chrome/app/generated_resources.grd

@@ -4753,6 +4753,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_NTP_CUSTOM_LINKS_CANT_CREATE" desc="A catchall error message for when the shortcut cannot be created. (On the New Tab Page)">
        Can’t create shortcut
       </message>
+      <message name="IDS_NTP_CUSTOM_LINKS_CANT_EDIT" desc="A catchall error message for when the shortcut cannot be edited. (On the New Tab Page)">
+       Can’t edit shortcut
+      </message>
+      <message name="IDS_NTP_CUSTOM_LINKS_CANT_REMOVE" desc="A catchall error message for when the shortcut cannot be removed. (On the New Tab Page)">
+       Can’t remove shortcut
+      </message>
       <message name="IDS_NTP_CONFIRM_MSG_SHORTCUT_REMOVED" desc="The title of the shortcut removed confirmation message when removing a custom link. (On the New Tab Page)">
         Shortcut removed
       </message>

chrome/app/generated_resources_grd/IDS_NTP_CUSTOM_LINKS_CANT_EDIT.png.sha1

+1003b1822b245c7eed7a49cfa8f2f0f0bf4da4ef
\ No newline at end of file

chrome/app/generated_resources_grd/IDS_NTP_CUSTOM_LINKS_CANT_REMOVE.png.sha1

+d1bbc68f0327aa0d6735e73ae52352857339774b
\ No newline at end of file