Fix 6046544 Deleting a photo takes multiple steps and the flow is inconsistent with other deleting flows on other core apps

This CL adds a confirm dialog to delete command and removes all confirm/cancel menu items from the actionbar.

b:6046544
Change-Id: I3afe7b59b4f6d1216e192a621621f7bf544e1919
diff --git a/res/values/strings.xml b/res/values/strings.xml
index b0a01ee..e8bf0f4 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -94,7 +94,8 @@
 
     <!-- Details dialog "OK" button. Dismisses dialog. -->
     <string name="delete">Delete</string>
-    <string name="confirm_delete">Delete</string>
+    <string name="confirm_action">Confirm deletion?</string>
+    <string name="confirm">Confirm</string>
     <string name="cancel">Cancel</string>
     <string name="share">Share</string>