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

chrome/browser/extensions/extension_special_storage_policy.h

Index: chrome/browser/extensions/extension_special_storage_policy.h
diff --git a/chrome/browser/extensions/extension_special_storage_policy.h b/chrome/browser/extensions/extension_special_storage_policy.h
index a7b0992aedbe2dae63be07294c27ed0bdcfb01ce..821b075bf27c3fa2f2b104a043e8c1384a512483 100644
--- a/chrome/browser/extensions/extension_special_storage_policy.h
+++ b/chrome/browser/extensions/extension_special_storage_policy.h
@@ -32,13 +32,13 @@ class ExtensionSpecialStoragePolicy : public storage::SpecialStoragePolicy {
 
   // storage::SpecialStoragePolicy methods used by storage subsystems and the
   // browsing data remover. These methods are safe to call on any thread.
-  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;
 
   // Methods used by the ExtensionService to populate this class.
   void GrantRightsForExtension(const extensions::Extension* extension,
@@ -55,7 +55,7 @@ class ExtensionSpecialStoragePolicy : public storage::SpecialStoragePolicy {
       const GURL& origin);
 
  protected:
-  virtual ~ExtensionSpecialStoragePolicy();
+  ~ExtensionSpecialStoragePolicy() override;
 
  private:
   class SpecialCollection {