Add override for overridden functions under /url This CL was uploaded…

… by git cl split.

R=mkwst@chromium.org

Bug: 428099
Change-Id: Ice6a3365769fe40b81100ac216a4066424955119
Reviewed-on: https://chromium-review.googlesource.com/1032459
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554357}

url/url_canon.h

@@ -156,7 +156,7 @@ class RawCanonOutputT : public CanonOutputT<T> {
     this->buffer_ = fixed_buffer_;
     this->buffer_len_ = fixed_capacity;
   }
-  virtual ~RawCanonOutputT() {
+  ~RawCanonOutputT() override {
     if (this->buffer_ != fixed_buffer_)
       delete[] this->buffer_;
   }