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

chrome/browser/component_updater/recovery_component_installer.cc

 // 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 "chrome/browser/component_updater/recovery_component_installer.h"
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 27 matching lines @@
 #else  // OS_LINUX, OS_MACOSX, etc.
     FILE_PATH_LITERAL("ChromeRecovery");
 #endif
 
 const char kRecoveryManifestName[] = "ChromeRecovery";
 
 }  // namespace
 
 class RecoveryComponentInstaller : public ComponentInstaller {
  public:
-  explicit RecoveryComponentInstaller(const Version& version,
-                                      PrefService* prefs);
+  RecoveryComponentInstaller(const Version& version,
+                             PrefService* prefs);
 
   virtual ~RecoveryComponentInstaller() {}
 
   virtual void OnUpdateError(int error) OVERRIDE;
 
   virtual bool Install(base::DictionaryValue* manifest,
                        const FilePath& unpack_path) OVERRIDE;
 
  private:
   Version current_version_;
@@ skipping 78 matching lines @@
 #if !defined(OS_CHROMEOS)
   // We delay execute the registration because we are not required in
   // the critical path during browser startup.
   BrowserThread::PostDelayedTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&RecoveryRegisterHelper, cus, prefs),
       base::TimeDelta::FromSeconds(6));
 #endif
 }