Implement File constructor.

Source/core/fileapi/BlobBuilder.h

Index: Source/core/fileapi/BlobBuilder.h
diff --git a/Source/core/fileapi/BlobBuilder.h b/Source/core/fileapi/BlobBuilder.h
index 560a79c8d1ea8825e809f2858a9aee960a176d7f..cdf3cc562a93b2409e8d8336b0bc24a4fb90462d 100644
--- a/Source/core/fileapi/BlobBuilder.h
+++ b/Source/core/fileapi/BlobBuilder.h
@@ -34,15 +34,10 @@
 #include "platform/blob/BlobData.h"
 #include "wtf/Forward.h"
 
-namespace WTF{
-class TextEncoding;
-}
-
 namespace WebCore {
 
 class Blob;
-
-typedef int ExceptionCode;
+class File;
 
 class BlobBuilder {
 public:
@@ -53,7 +48,8 @@ public:
     void append(ArrayBuffer*);
     void append(ArrayBufferView*);
 
-    PassRefPtr<Blob> getBlob(const String& contentType);
+    PassRefPtr<Blob> createBlob(const String& contentType);
+    PassRefPtr<File> createFile(const String& contentType, const String& fileName, double modificationTime);
 
 private:
     void appendBytesData(const void*, size_t);