Re-write many calls to WrapUnique() with MakeUnique()

headless/lib/headless_browser_context_browsertest.cc

Index: headless/lib/headless_browser_context_browsertest.cc
diff --git a/headless/lib/headless_browser_context_browsertest.cc b/headless/lib/headless_browser_context_browsertest.cc
index 305dce41175a381949c6874506a5c977857a3911..3899df3e413b2098ad70382ee8bf6b154a26c35f 100644
--- a/headless/lib/headless_browser_context_browsertest.cc
+++ b/headless/lib/headless_browser_context_browsertest.cc
@@ -160,7 +160,7 @@ IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, ContextProtocolHandler) {
   const std::string kResponseBody = "<p>HTTP response body</p>";
   ProtocolHandlerMap protocol_handlers;
   protocol_handlers[url::kHttpScheme] =
-      base::WrapUnique(new TestProtocolHandler(kResponseBody));
+      base::MakeUnique<TestProtocolHandler>(kResponseBody);
 
   // Load a page which doesn't actually exist, but which is fetched by our
   // custom protocol handler.