Revert 244857 "net: Remove classes which were used only by Chrom..."

> net: Remove classes which were used only by Chrome Frame
> 
> UploadData and UploadFileElementReaderSync were used only by Chrome Frame
> 
> BUG=None
> TEST=build
> R=mmenke@chromium.org
> TBR=jam@chromium.org for content/child/resource_dispatcher_unittests.cc
> 
> Review URL: https://codereview.chromium.org/131903004

TBR=hashimoto@chromium.org

Review URL: https://codereview.chromium.org/139263007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244982 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244982