Revert "Remove OwnPtr from Blink."

third_party/WebKit/public/platform/WebTaskRunner.h

Index: third_party/WebKit/public/platform/WebTaskRunner.h
diff --git a/third_party/WebKit/public/platform/WebTaskRunner.h b/third_party/WebKit/public/platform/WebTaskRunner.h
index 2fee34c282bac899ed11747e000304ebdc36392d..81ac626419d6f7dca2a20be4939f4e49f146fc97 100644
--- a/third_party/WebKit/public/platform/WebTaskRunner.h
+++ b/third_party/WebKit/public/platform/WebTaskRunner.h
@@ -9,8 +9,6 @@
 
 #ifdef INSIDE_BLINK
 #include "wtf/Functional.h"
-#include "wtf/PtrUtil.h"
-#include <memory>
 #endif
 
 namespace blink {
@@ -68,9 +66,9 @@ public:
     void postTask(const WebTraceLocation&, std::unique_ptr<SameThreadClosure>);
     void postDelayedTask(const WebTraceLocation&, std::unique_ptr<SameThreadClosure>, long long delayMs);
 
-    std::unique_ptr<WebTaskRunner> adoptClone()
+    PassOwnPtr<WebTaskRunner> adoptClone()
     {
-        return wrapUnique(clone());
+        return adoptPtr(clone());
     }
 #endif
 };