Update from https://crrev.com/309415

Review URL: https://codereview.chromium.org/822713002

url_canon.h

diff --git a/url_canon.h b/url_canon.h
index 3b9f906..89e3509 100644
--- a/url_canon.h
+++ b/url_canon.h
@@ -154,7 +154,7 @@
       delete[] this->buffer_;
   }
 
-  virtual void Resize(int sz) {
+  void Resize(int sz) override {
     T* new_buf = new T[sz];
     memcpy(new_buf, this->buffer_,
            sizeof(T) * (this->cur_len_ < sz ? this->cur_len_ : sz));