Fix official Mac build for strict virtual annotations check.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

 // Copyright (c) 2013 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/widevine_cdm_component_installer.h"
 
 #include <stdint.h>
 #include <string.h>
 #include <string>
 #include <vector>
@@ skipping 216 matching lines @@
   // update their plugin list caches.
   PluginService::GetInstance()->RefreshPlugins();
   PluginService::GetInstance()->PurgePluginListCache(NULL, false);
 }
 
 }  // namespace
 
 class WidevineCdmComponentInstallerTraits : public ComponentInstallerTraits {
  public:
   WidevineCdmComponentInstallerTraits();
-  virtual ~WidevineCdmComponentInstallerTraits() {}
+  ~WidevineCdmComponentInstallerTraits() override {}

[dcheng, 2015/01/13 21:52:51]

Note: I left this due to the discussion on
https://codereview.chromium.org/826213004 (namely, to guarantee this class has a
virtual dtor), but I don't know how important it is--the base class already has
a virtual dtor.

 
  private:
   // The following methods override ComponentInstallerTraits.
-  virtual bool CanAutoUpdate() const override;
-  virtual bool OnCustomInstall(const base::DictionaryValue& manifest,
+  bool CanAutoUpdate() const override;
+  bool OnCustomInstall(const base::DictionaryValue& manifest,
                                const base::FilePath& install_dir) override;
-  virtual bool VerifyInstallation(
+  bool VerifyInstallation(
       const base::DictionaryValue& manifest,
       const base::FilePath& install_dir) const override;
-  virtual void ComponentReady(
+  void ComponentReady(
       const base::Version& version,
       const base::FilePath& path,
       scoped_ptr<base::DictionaryValue> manifest) override;
-  virtual base::FilePath GetBaseDirectory() const override;
-  virtual void GetHash(std::vector<uint8_t>* hash) const override;
-  virtual std::string GetName() const override;
+  base::FilePath GetBaseDirectory() const override;
+  void GetHash(std::vector<uint8_t>* hash) const override;
+  std::string GetName() const override;
 
   // Checks and updates CDM adapter if necessary to make sure the latest CDM
   // adapter is always used.
   // Note: The component is ready when CDM is present, but the CDM won't be
   // registered until the adapter is copied by this function (see
   // VerifyInstallation).
   void UpdateCdmAdapter(const base::Version& cdm_version,
                         const base::FilePath& cdm_install_dir,
                         scoped_ptr<base::DictionaryValue> manifest);
 
@@ skipping 110 matching lines @@
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(traits.Pass());
   installer->Register(cus);
 #else
   return;
 #endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 }
 
 }  // namespace component_updater