Move [Abandon] action back up to the top-level

Abandon actions are moved out of the overflow actions menu to the top
level on account of its frequent use in common workflows.

Bug: Issue 5436
Change-Id: I77f1e15db12412ec4d2a3476cb547744d7fe403a

polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.html

diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.html b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.html
index 982e400..9f31550 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.html
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.html
@@ -81,7 +81,6 @@
           down-arrow
           vertical-offset="32"
           horizontal-align="right"
-          on-tap-item-abandon="_handleAbandonTap"
           on-tap-item-cherrypick="_handleCherrypickTap"
           on-tap-item-delete="_handleDeleteTap"
           hidden$="[[_shouldHideActions(_menuActions.*, _loading)]]"

polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js

diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
index 69f4f57..148b724 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
@@ -92,7 +92,6 @@
    * set of action buttons.
    */
   var MENU_ACTION_KEYS = [
-    'abandon',
     'cherrypick',
     '/', // '/' is the key for the delete action.
   ];
@@ -452,6 +451,8 @@
         this._handleRevisionAction(key);
       } else if (key === ChangeActions.REVERT) {
         this.showRevertDialog();
+      } else if (key === ChangeActions.ABANDON) {
+        this._showActionDialog(this.$.confirmAbandonDialog);
       } else if (key === QUICK_APPROVE_ACTION.key) {
         var action = this._allActionValues.find(function(o) {
           return o.key === key;