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