Add a "disable autofill" checkbox to the setup prompt

Make the intent of the buttons in the setup autofill dialog
clearer by adding an option to disable the feature. The cancel
button now simply dismisses the dialog and we only disable the
feature if the user checks the new box and clicks OK. Clicking OK
without checking the box takes the user to the prdoile editor as
before.

Bug:3348828
Change-Id: Ib54b879b6953d0c8865d50374188059a43a8e6ba
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 5452b63..9771e18 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -425,6 +425,9 @@
     <!-- Toast message displayed when the user decides to not set up autofill at this time. We want to remind them that they can configure
          it through the Browser Settings menu. [CHAR-LIMIT=NONE] -->
     <string name="autofill_setup_dialog_negative_toast">AutoFill can always be configured through Browser Settings.</string>
+    <!-- Text on a checkbox in the "setup autofill" dialog which is shown to the user when they are prompted to set up the autofill feature.
+         The checkbox allows them to specify they would like to disable the feature altogether [CHAR-LIMIT=NONE] -->
+    <string name="disable_autofill">Disable AutoFill</string>
 
     <!-- Settings screen, section title [CHAR-LIMIT=50] -->
     <string name="pref_privacy_security_title">Privacy &amp; Security</string>