Partly revert 4ec3554a80f065c2d9c957d6ce7f577fb195be02

mpEvents is freed by other object so using
scoped_ptr lead to crash.

Change-Id: I28c9d322b5ee5da6edf5022da18b42f59b608dec
avmedia: call resize before player window is created

Since b5529c8c457f442bfc43305becc0c02d6a09ee80
MediaChildWindow is depend on the media URL so
it is constructed later and so one resizing is
missed before creating the player window which
causes to display nothing in the media player
(Tools -> Media Player)

Change-Id: I548e6bb73193fccd1735e8343e9c06428ee686bc