Always enable Oilpan for EventSource.

Source/modules/fetch/Body.cpp

Index: Source/modules/fetch/Body.cpp
diff --git a/Source/modules/fetch/Body.cpp b/Source/modules/fetch/Body.cpp
index 0be313e412339d2df44a9ff3303435e9b7786011..739a7cb004f953289c68f650e6c7081af3d0f8d1 100644
--- a/Source/modules/fetch/Body.cpp
+++ b/Source/modules/fetch/Body.cpp
@@ -191,7 +191,7 @@ private:
                     return onClose();
             } else {
                 FileReaderLoader::ReadType readType = FileReaderLoader::ReadAsArrayBuffer;
-                m_loader = adoptPtr(new FileReaderLoader(readType, this));
+                m_loader = FileReaderLoader::create(readType, this);
                 m_loader->start(executionContext(), m_blobDataHandle);
             }
         }
@@ -391,7 +391,7 @@ void Body::readAsyncFromBlob(PassRefPtr<BlobDataHandle> handle)
         ASSERT_NOT_REACHED();
     }
 
-    m_loader = adoptPtr(new FileReaderLoader(readType, this));
+    m_loader = FileReaderLoader::create(readType, this);
     m_loader->start(m_resolver->scriptState()->executionContext(), blobHandle);
 
     return;