Handle Escape key on constrained window.

chrome/browser/resources/print_preview/print_preview.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO(rltoscano): Might be a problem where might be in fetching destinations
 // state, then to file selection state, then cancel, which results in the
 // fetching destinations state being lost.
 
 // TODO(rltoscano): Move data/* into print_preview.data namespace
 
@@ skipping 786 matching lines @@
       this.close_();
     },
 
     /**
      * Consume escape key presses and ctrl + shift + p. Delegate everything else
      * to the preview area.
      * @param {KeyboardEvent} e The keyboard event.
      * @private
      */
     onKeyDown_: function(e) {
-      // Escape key closes the dialog.
-      if (e.keyCode == 27 && !e.shiftKey && !e.ctrlKey && !e.altKey &&
-          !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) ||
             (!cr.isMac && e.shiftKey && e.ctrlKey && !e.altKey && !e.metaKey)) {
           this.openSystemPrintDialog_();
           e.preventDefault();
           return;
         }
       }
 
@@ skipping 83 matching lines @@
 <include src="settings/margin_settings.js"/>
 <include src="settings/destination_settings.js"/>
 <include src="settings/other_options_settings.js"/>
 
 <include src="previewarea/margin_control.js"/>
 <include src="previewarea/margin_control_container.js"/>
 <include src="previewarea/preview_area.js"/>
 <include src="preview_generator.js"/>
 
 var printPreview = new print_preview.PrintPreview();