[PR] Updates the edit flow in PaymentRequest UI

1. Exits 'edit' mode after saving or canceling changes to an address,
   credit card, or contact info.
2. Changes the label of the edit screen's 'Done' button to 'Save'.

TBR=sdefresne@

Bug: 814856
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie69697299e92d7f8a922104f84c002c37b5a442b
Reviewed-on: https://chromium-review.googlesource.com/1007865
Commit-Queue: Moe Ahmadi <[email protected]>
Reviewed-by: Eugene But <[email protected]>
Cr-Commit-Position: refs/heads/master@{#550388}
diff --git a/components/components_strings.grd b/components/components_strings.grd
index 9134fb8..3b1c6bfa 100644
--- a/components/components_strings.grd
+++ b/components/components_strings.grd
@@ -298,6 +298,9 @@
       <message name="IDS_ACCNAME_DONE" desc="The accessible name for the DONE button.">
         Done
       </message>
+      <message name="IDS_ACCNAME_SAVE" desc="The accessible name for the SAVE button.">
+        Save
+      </message>
       <message name="IDS_ACCNAME_CLOSE" desc="The accessible name for the Close button.">
         Close
       </message>