Handle Escape key on constrained window.

chrome/browser/resources/print_preview/print_preview.js

Index: chrome/browser/resources/print_preview/print_preview.js
diff --git a/chrome/browser/resources/print_preview/print_preview.js b/chrome/browser/resources/print_preview/print_preview.js
index 6b417bfbdab6729bfd040460d5eab8761c93d5f2..66dbe1899f65f5d16ab37e7a05a4a6dfd621695f 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -625,6 +625,9 @@ cr.define('print_preview', function() {
      */
     onKeyDown_: function(e) {
       // Escape key closes the dialog.
+      // <if expr="not pp_ifdef('toolkit_views')">
+      // On the toolkit_views environment, ESC key is handled by C++-side
+      // instead of JS-side.
       if (e.keyCode == 27 && !e.shiftKey && !e.ctrlKey && !e.altKey &&
           !e.metaKey) {
         if (this.destinationSearch_.getIsVisible()) {
@@ -637,6 +640,7 @@ cr.define('print_preview', function() {
         e.preventDefault();
         return;
       }
+      // </if>
 
       // Ctrl + Shift + p / Mac equivalent.
       if (e.keyCode == 80) {