Revert 232877 "Switch the WebstoreDataFetcherDelegate::OnWebstor..."

http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Builder/builds/58330

> Switch the WebstoreDataFetcherDelegate::OnWebstoreResponseParseSuccess interface to scoped_ptr.
> 
> Fixes memory leaks.
> 
> BUG=313695
> R=benwells@chromium.org
> TBR=satorux@chromium.org
> 
> Review URL: https://codereview.chromium.org/51113014

TBR=earthdok@chromium.org

Review URL: https://codereview.chromium.org/58773002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232880 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232880