[filebrowser] Prevent mouse events on the eject button except the designated handler.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 
 /**
  * FileManager constructor.
  *
@@ skipping 1855 matching lines @@
     li.appendChild(div);
 
     if (rootType == DirectoryModel.RootType.ARCHIVE ||
         rootType == DirectoryModel.RootType.REMOVABLE) {
       var spacer = this.document_.createElement('div');
       spacer.className = 'spacer';
       li.appendChild(spacer);
 
       var eject = this.document_.createElement('div');
       eject.className = 'root-eject';
-      eject.addEventListener('click',
-          this.unmountVolume_.bind(this, entry.toURL()));
+      eject.addEventListener('click', function(event) {
+        event.stopPropagation();
+        this.unmountVolume_(entry.toURL());
+      }.bind(this));
+      // Block other mouse handlers.
+      eject.addEventListener('mouseup', function(e) { e.stopPropagation() });
+      eject.addEventListener('mousedown', function(e) { e.stopPropagation() });
       li.appendChild(eject);
 
       cr.ui.contextMenuHandler.setContextMenu(li, this.rootsContextMenu_);
     }
 
     cr.defineProperty(li, 'lead', cr.PropertyKind.BOOL_ATTR);
     cr.defineProperty(li, 'selected', cr.PropertyKind.BOOL_ATTR);
     return li;
   };
 
@@ skipping 2544 matching lines @@
           });
       }, onError);
 
       function onError(err) {
         console.log('Error while checking free space: ' + err);
         setTimeout(doCheck, 1000 * 60);
       }
     }
   }
 })();