Add missing (and remove superfluous) 'explicit' from constructors.

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_base_controller.mm

 // 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.
 
 #include <stack>
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_editor_base_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 74 matching lines @@
                                    url:details.url
                                  title:details.title
                          configuration:configuration];
   }
   [controller runAsModalSheet];
 }
 
 // Adapter to tell BookmarkEditorBaseController when bookmarks change.
 class BookmarkEditorBaseControllerBridge : public BookmarkModelObserver {
  public:
-  BookmarkEditorBaseControllerBridge(BookmarkEditorBaseController* controller)
+  explicit BookmarkEditorBaseControllerBridge(
+      BookmarkEditorBaseController* controller)
       : controller_(controller),
         importing_(false)
   { }
 
   virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE {
     [controller_ modelChangedPreserveSelection:YES];
   }
 
   virtual void BookmarkNodeMoved(BookmarkModel* model,
                                  const BookmarkNode* old_parent,
@@ skipping 571 matching lines @@
 }
 
 // Implementing isEqual: allows the NSTreeController to preserve the selection
 // and open/shut state of outline items when the data changes.
 - (BOOL)isEqual:(id)other {
   return [other isKindOfClass:[BookmarkFolderInfo class]] &&
       folderNode_ == [(BookmarkFolderInfo*)other folderNode];
 }
 
 @end