Update virtual/final usage in url/.

BUG=417463
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/658563010

Cr-Commit-Position: refs/heads/master@{#300620}

url/url_canon_icu.h

@@ -24,11 +24,11 @@ class URL_EXPORT ICUCharsetConverter : public CharsetConverter {
   // be managed by the creator such that it is alive as long as this is.
   ICUCharsetConverter(UConverter* converter);
 
-  virtual ~ICUCharsetConverter();
+  ~ICUCharsetConverter() override;
 
-  virtual void ConvertFromUTF16(const base::char16* input,
-                                int input_len,
-                                CanonOutput* output) override;
+  void ConvertFromUTF16(const base::char16* input,
+                        int input_len,
+                        CanonOutput* output) override;
 
  private:
   // The ICU converter, not owned by this class.

url/url_canon_stdstring.h

@@ -36,12 +36,12 @@ namespace url {
 class URL_EXPORT StdStringCanonOutput : public CanonOutput {
  public:
   StdStringCanonOutput(std::string* str);
-  virtual ~StdStringCanonOutput();
+  ~StdStringCanonOutput() override;
 
   // Must be called after writing has completed but before the string is used.
   void Complete();
 
-  virtual void Resize(int sz) override;
+  void Resize(int sz) override;
 
  protected:
   std::string* str_;