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

chrome/browser/ui/cocoa/importer/import_progress_dialog_cocoa.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_IMPORTER_IMPORT_PROGRESS_DIALOG_H_
 #define CHROME_BROWSER_IMPORTER_IMPORT_PROGRESS_DIALOG_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
@@ skipping 54 matching lines @@
 // Methods called by importer_host via ImporterObserverBridge.
 - (void)ImportItemStarted:(importer::ImportItem)item;
 - (void)ImportItemEnded:(importer::ImportItem)item;
 - (void)ImportEnded;
 
 @end
 
 // C++ -> objc bridge for import status notifications.
 class ImporterObserverBridge : public importer::ImporterProgressObserver {
  public:
-  ImporterObserverBridge(ImportProgressDialogController* owner);
+  explicit ImporterObserverBridge(ImportProgressDialogController* owner);
   virtual ~ImporterObserverBridge();
 
  private:
   // importer::ImporterProgressObserver:
   virtual void ImportStarted() OVERRIDE;
   virtual void ImportItemStarted(importer::ImportItem item) OVERRIDE;
   virtual void ImportItemEnded(importer::ImportItem item) OVERRIDE;
   virtual void ImportEnded() OVERRIDE;
 
   ImportProgressDialogController* owner_;
 
   DISALLOW_COPY_AND_ASSIGN(ImporterObserverBridge);
 };
 
 #endif  // CHROME_BROWSER_IMPORTER_IMPORT_PROGRESS_DIALOG_H_