Remove DragDataRef.h, it was only providing a typedef.

It was an abstraction when different WebKit ports provided different
types, but isn't needed in blink.

BUG=None

Review URL: https://chromiumcodereview.appspot.com/22441005

git-svn-id: svn://svn.chromium.org/blink/trunk@155811 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Removing DropShadowImageFilter to use skia's SkDropShadowImageFilter instead.

R=senorblanco
BUG=270218

Review URL: https://chromiumcodereview.appspot.com/22630007

git-svn-id: svn://svn.chromium.org/blink/trunk@155812 bbb929c8-8fbe-4397-9dbb-9b2b20218538