When we add a blob into the FormData in out BlobData model, we're adding the blob URL. We need to add the blob URL member to FormDataElement.
Created attachment 65040 [details]
Attachment 65040 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1
WebCore/platform/network/FormData.h:79: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] 
Total errors found: 1 in 6 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 65044 [details]
Fix style error.
Comment on attachment 65044 [details]
+ result.fileStart = 0;
nit: these fields exist regardless of whether or not ENABLE(BLOB) is defined,
so they probably should be initialized even when ENABLE(BLOB) is not defined.
Committed as http://trac.webkit.org/changeset/65786.