[AF] Makes the credit card save infobar dismiss prompt title-case aware

This only affects Mac and iOS. Android and Linux will keep using the
non-title-cased version.

Bug: 841758
Change-Id: I82d0c4e6ffc5d6e9975ffd18f33c56957023592e
Reviewed-on: https://chromium-review.googlesource.com/1061589Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559241}

components/components_strings.grd

@@ -238,9 +238,16 @@
       <message name="IDS_SAVE" desc="Used on a button to save information you are editing.">
         Save
       </message>
-      <message name="IDS_NO_THANKS" desc="Used to dismiss various prompts.">
-        No thanks
-      </message>
+      <if expr="not use_titlecase">
+        <message name="IDS_NO_THANKS" desc="Used to dismiss various prompts.">
+          No thanks
+        </message>
+      </if>
+      <if expr="use_titlecase">
+        <message name="IDS_NO_THANKS" desc="In Title Case: Used to dismiss various prompts.">
+          No Thanks
+        </message>
+      </if>
       <if expr="not use_titlecase">
         <message name="IDS_NOT_NOW" desc="Used on a button that avoids taking a suggested action.  The action will likely be suggested again or automatically taken later.">
           Not now