Nuke WebPassOwnPtr<T> and replace it with std::unique_ptr<T>.

third_party/WebKit/public/platform/WebURLLoaderMockFactory.h

Index: third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
diff --git a/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h b/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
index a2e6c9557279180b0a433bf3af27f0bea3b1822d..50ad556f21f3288206b0f197a1020a9ba7f6164d 100644
--- a/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
+++ b/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
@@ -7,10 +7,11 @@
 
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebData.h"
-#include "public/platform/WebPassOwnPtr.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURLLoaderTestDelegate.h"
 
+#include <memory>
+
 namespace blink {
 
 class WebURL;
@@ -19,7 +20,7 @@ struct WebURLError;
 
 class WebURLLoaderMockFactory {
 public:
-    static WebPassOwnPtr<WebURLLoaderMockFactory> create();
+    static std::unique_ptr<WebURLLoaderMockFactory> create();
 
     virtual ~WebURLLoaderMockFactory() {}