Standardize usage of virtual/override/final in content/

content/public/test/mock_special_storage_policy.h

Index: content/public/test/mock_special_storage_policy.h
diff --git a/content/public/test/mock_special_storage_policy.h b/content/public/test/mock_special_storage_policy.h
index 271f6468ca71aa93f90808515a3d03373828b7fe..d708827512bc0d39c9041d43e8f172580ca12d2b 100644
--- a/content/public/test/mock_special_storage_policy.h
+++ b/content/public/test/mock_special_storage_policy.h
@@ -19,13 +19,13 @@ class MockSpecialStoragePolicy : public storage::SpecialStoragePolicy {
  public:
   MockSpecialStoragePolicy();
 
-  virtual bool IsStorageProtected(const GURL& origin) override;
-  virtual bool IsStorageUnlimited(const GURL& origin) override;
-  virtual bool IsStorageSessionOnly(const GURL& origin) override;
-  virtual bool CanQueryDiskSize(const GURL& origin) override;
-  virtual bool IsFileHandler(const std::string& extension_id) override;
-  virtual bool HasIsolatedStorage(const GURL& origin) override;
-  virtual bool HasSessionOnlyOrigins() override;
+  bool IsStorageProtected(const GURL& origin) override;
+  bool IsStorageUnlimited(const GURL& origin) override;
+  bool IsStorageSessionOnly(const GURL& origin) override;
+  bool CanQueryDiskSize(const GURL& origin) override;
+  bool IsFileHandler(const std::string& extension_id) override;
+  bool HasIsolatedStorage(const GURL& origin) override;
+  bool HasSessionOnlyOrigins() override;
 
   void AddProtected(const GURL& origin) {
     protected_.insert(origin);
@@ -86,7 +86,7 @@ class MockSpecialStoragePolicy : public storage::SpecialStoragePolicy {
   }
 
  protected:
-  virtual ~MockSpecialStoragePolicy();
+  ~MockSpecialStoragePolicy() override;
 
  private:
   std::set<GURL> protected_;