Standardize usage of virtual/override/final specifiers.

content/child/web_url_loader_impl_unittest.cc

Index: content/child/web_url_loader_impl_unittest.cc
diff --git a/content/child/web_url_loader_impl_unittest.cc b/content/child/web_url_loader_impl_unittest.cc
index a7e57e43080821b6809f9d193fb247dd1e7994d2..50cff38b7c79762299ddb96e9ccd0bc769c0124c 100644
--- a/content/child/web_url_loader_impl_unittest.cc
+++ b/content/child/web_url_loader_impl_unittest.cc
@@ -285,7 +285,7 @@ class TestWebURLLoaderClient : public blink::WebURLLoaderClient {
 class WebURLLoaderImplTest : public testing::Test {
  public:
   explicit WebURLLoaderImplTest() : client_(&dispatcher_) {}
-  virtual ~WebURLLoaderImplTest() {}
+  ~WebURLLoaderImplTest() override {}
 
   void DoStartAsyncRequest() {
     blink::WebURLRequest request;