Fix ESC not closing the print preview dialog on Mac

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 7bc676c66b8da44a1da303b80a6714f1ded01c11..cb2434132c14b50a53eecb3b43993f51cbd2ffa8 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -872,15 +872,12 @@ cr.define('print_preview', function() {
       // Escape key closes the dialog.
       if (e.keyCode == 27 && !e.shiftKey && !e.ctrlKey && !e.altKey &&
           !e.metaKey) {
-<if expr="toolkit_views">
-        // On the toolkit_views environment, ESC key is handled by C++-side
-        // instead of JS-side.
-        return;
-</if>
-<if expr="not toolkit_views">
-        this.close_();
-</if>
-        e.preventDefault();
+        // On non-mac with toolkit-views, ESC key is handled by C++-side instead
+        // of JS-side.
+        if (cr.isMac) {
+          this.close_();
+          e.preventDefault();
+        }
         return;
       }