Make user remove button focusable, and set up the correct tab order.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index dd5f681723bb2521eb0a35fd445c18141b5fa123..926f080ad7f0e1272b658324736038f3c26c1f8b 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14127,6 +14127,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_LOGIN_POD_PASSWORD_FIELD_ACCESSIBLE_NAME" desc="Text to be spoken when the focus is set to the password field of a user pod on the login screen.">
         Password for <ph name="USER_EMAIL_ADDRESS">$1<ex>john.doe@example.com</ex></ph>
       </message>
+      <message name="IDS_LOGIN_POD_REMOVE_BUTTON_ACCESSIBLE_NAME" desc="Text to be spoken when the focus is set to the remove button of a user pod on the login screen.">
+        Remove user <ph name="USER_EMAIL_ADDRESS">$1<ex>john.doe@example.com</ex></ph>
+      </message>
       <message name="IDS_LOGIN_VERSION_LABEL_FORMAT" desc="Login screen version text format.">
         <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> <ph name="PRODUCT_VERSION">$2<ex>15.0.0.0</ex></ph> (Platform <ph name="PLATFORM_VERSION">$3<ex>900.0-11.09.01</ex></ph>)
       </message>