Failure in reading Blob URL should results in network error

third_party/WebKit/Source/platform/loader/fetch/ResourceError.h

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceError.h
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceError.h b/third_party/WebKit/Source/platform/loader/fetch/ResourceError.h
index 0699f5959da6270e105c9e45f3c6d791f71812da..d0b2b02b89b109417fa30f07adb4ca62d792665c 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceError.h
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceError.h
@@ -124,6 +124,9 @@ class PLATFORM_EXPORT ResourceError final {
   bool WasBlockedByResponse() const {
     return error_code_ == net::ERR_BLOCKED_BY_RESPONSE;
   }
+  bool IsFileNotFoundError() const {
+    return error_code_ == net::ERR_FILE_NOT_FOUND;
+  }
 
   void SetShouldCollapseInitiator(bool should_collapse_initiator) {
     should_collapse_initiator_ = should_collapse_initiator;