[Mac] Chrome print dialog disregards system cancel key-command.

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 3d52bee54ca6b55a7e79abe1b0d4a8ece08cfead..79d7f620e7e92de904146f72fddd765e96787094 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -855,6 +855,13 @@ cr.define('print_preview', function() {
         return;
       }
 
+      // On Mac, Cmd- should close the print dialog.
+      if (cr.isMac && e.keyCode == 189 && e.metaKey) {
+        this.close_();
+        e.preventDefault();
+        return;
+      }
+
       // Ctrl + Shift + p / Mac equivalent.
       if (e.keyCode == 80) {
         if ((cr.isMac && e.metaKey && e.altKey && !e.shiftKey && !e.ctrlKey) ||