Oilpan: fix build after r192119.

Source/core/fetch/CachingCorrectnessTest.cpp

Index: Source/core/fetch/CachingCorrectnessTest.cpp
diff --git a/Source/core/fetch/CachingCorrectnessTest.cpp b/Source/core/fetch/CachingCorrectnessTest.cpp
index c13207656f90fc589e27310d3481fbb61d1f8770..b729004a7782da1ba3c50864f2a29f05119eb7d0 100644
--- a/Source/core/fetch/CachingCorrectnessTest.cpp
+++ b/Source/core/fetch/CachingCorrectnessTest.cpp
@@ -63,7 +63,7 @@ class MockFetchContext : public FetchContext {
 public:
     static PassOwnPtrWillBeRawPtr<MockFetchContext> create()
     {
-        return adoptPtr(new MockFetchContext);
+        return adoptPtrWillBeNoop(new MockFetchContext);
     }
 
     ~MockFetchContext() { }