Standardize usage of virtual/override/final in chrome/browser/prefs

The Google C++ style guide states:

  Explicitly annotate overrides of virtual functions or virtual
  destructors with an override or (less frequently) final specifier.
  Older (pre-C++11) code will use the virtual keyword as an inferior
  alternative annotation. For clarity, use exactly one of override,
  final, or virtual when declaring an override.

To better conform to these guidelines, the following constructs have
been rewritten:

- if a base class has a virtual destructor, then:
    virtual ~Foo();                   ->  ~Foo() override;
- virtual void Foo() override;        ->  void Foo() override;
- virtual void Foo() override final;  ->  void Foo() final;

This patch was automatically generated. The clang plugin can generate
fixit hints, which are suggested edits when it is 100% sure it knows how
to fix a problem. The hints from the clang plugin were applied to the
source tree using the tool in https://codereview.chromium.org/598073004.

BUG=417463
R=gab@chromium.org

Review URL: https://codereview.chromium.org/668983002

Cr-Commit-Position: refs/heads/master@{#300903}

1 files changed, 2 insertions, 2 deletions

diff --git a/chrome/browser/prefs/pref_service_syncable.h b/chrome/browser/prefs/pref_service_syncable.h
index fd799b3..c1b4960 100644
--- a/chrome/browser/prefs/pref_service_syncable.h
+++ b/chrome/browser/prefs/pref_service_syncable.h
@@ -44,7 +44,7 @@ class PrefServiceSyncable : public PrefService {
       base::Callback<void(PersistentPrefStore::PrefReadError)>
           read_error_callback,
       bool async);
-  virtual ~PrefServiceSyncable();
+  ~PrefServiceSyncable() override;
 
   // Creates an incognito copy of the pref service that shares most pref stores
   // but uses a fresh non-persistent overlay for the user pref store and an
@@ -79,7 +79,7 @@ class PrefServiceSyncable : public PrefService {
   syncer::SyncableService* GetSyncableService(const syncer::ModelType& type);
 
   // Do not call this after having derived an incognito or per tab pref service.
-  virtual void UpdateCommandLinePrefStore(PrefStore* cmd_line_store) override;
+  void UpdateCommandLinePrefStore(PrefStore* cmd_line_store) override;
 
   void AddSyncedPrefObserver(const std::string& name,
                              SyncedPrefObserver* observer);