Always enable Oilpan for EventSource.

Source/core/fileapi/FileReaderSync.cpp

Index: Source/core/fileapi/FileReaderSync.cpp
diff --git a/Source/core/fileapi/FileReaderSync.cpp b/Source/core/fileapi/FileReaderSync.cpp
index 9fa763a13efc57e7604f1670cb826b49f3588518..b2b8004c030b0422539343b98879f1aa38003944 100644
--- a/Source/core/fileapi/FileReaderSync.cpp
+++ b/Source/core/fileapi/FileReaderSync.cpp
@@ -52,7 +52,7 @@ PassRefPtr<DOMArrayBuffer> FileReaderSync::readAsArrayBuffer(ExecutionContext* e
         return nullptr;
     }
 
-    FileReaderLoader loader(FileReaderLoader::ReadAsArrayBuffer, 0);
+    FileReaderLoader loader(FileReaderLoader::ReadAsArrayBuffer, nullptr);
     startLoading(executionContext, loader, *blob, exceptionState);
 
     return loader.arrayBufferResult();
@@ -77,7 +77,7 @@ String FileReaderSync::readAsText(ExecutionContext* executionContext, Blob* blob
         return String();
     }
 
-    FileReaderLoader loader(FileReaderLoader::ReadAsText, 0);
+    FileReaderLoader loader(FileReaderLoader::ReadAsText, nullptr);
     loader.setEncoding(encoding);
     startLoading(executionContext, loader, *blob, exceptionState);
     return loader.stringResult();
@@ -90,7 +90,7 @@ String FileReaderSync::readAsDataURL(ExecutionContext* executionContext, Blob* b
         return String();
     }
 
-    FileReaderLoader loader(FileReaderLoader::ReadAsDataURL, 0);
+    FileReaderLoader loader(FileReaderLoader::ReadAsDataURL, nullptr);
     loader.setDataType(blob->type());
     startLoading(executionContext, loader, *blob, exceptionState);
     return loader.stringResult();