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

headless/lib/headless_browser_browsertest.cc

Index: headless/lib/headless_browser_browsertest.cc
diff --git a/headless/lib/headless_browser_browsertest.cc b/headless/lib/headless_browser_browsertest.cc
index 998b112c478890281899e626756f9b62a7a3907c..e22e77a8458f58d058bd784f8096ffa99df1d69d 100644
--- a/headless/lib/headless_browser_browsertest.cc
+++ b/headless/lib/headless_browser_browsertest.cc
@@ -240,7 +240,7 @@ IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, HttpProtocolHandler) {
   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);
 
   HeadlessBrowserContext* browser_context =
       browser()
@@ -269,7 +269,7 @@ IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, HttpsProtocolHandler) {
   const std::string kResponseBody = "<p>HTTPS response body</p>";
   ProtocolHandlerMap protocol_handlers;
   protocol_handlers[url::kHttpsScheme] =
-      base::WrapUnique(new TestProtocolHandler(kResponseBody));
+      base::MakeUnique<TestProtocolHandler>(kResponseBody);
 
   HeadlessBrowserContext* browser_context =
       browser()
@@ -451,7 +451,7 @@ IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, ReadCookiesInProtocolHandler) {
   net::CookieList sent_cookies;
   ProtocolHandlerMap protocol_handlers;
   protocol_handlers[url::kHttpsScheme] =
-      base::WrapUnique(new ProtocolHandlerWithCookies(&sent_cookies));
+      base::MakeUnique<ProtocolHandlerWithCookies>(&sent_cookies);
 
   HeadlessBrowserContext* browser_context =
       browser()