Revert 256981 &quotVerify FormatType in ScopedClipboardWriter::Write...&quot

      > Verify FormatType in ScopedClipboardWriter::WritePickledData.
> 
> BUG=352395
> R=tony@chromium.org
> TBR=sky@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256974
> 
> Review URL: https://codereview.chromium.org/199763002

TBR=dcheng@chromium.org

Review URL: https://codereview.chromium.org/196943018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257336 0039d316-1c4b-4281-b951-d872f2087c98