Do no check seek offset against internal size on gstreamer source element

https://bugs.webkit.org/show_bug.cgi?id=116533

Reviewed by Philippe Normand.

The internal size on gstreamer source element may be wrong in case the received size in
didReceiveResponse is not accurate. Lets just try to seek and let it fail if necessary.

* platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:
(webKitWebSrcSeekDataCb):

Change-Id: Iacdd4e3f615528ba8bff2f1d6510855d45f9e1af
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153787 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
[GStreamer] cannot play live streams

https://bugs.webkit.org/show_bug.cgi?id=116831

Reviewed by Philippe Normand.

Source/WebCore:

Fix issues with rtsp streams embedded on <video> not loading.

* platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:
Do not reset pipeline to READY state on STATE_CHANGE_ASYNC when entering PAUSED state for
live streams, otherwise we enter an endless loop of READY->PAUSED->READY->PAUSED when
starting playback.

Change-Id: Iec00e0f41ca6b55994524c9864336f765c0d56d3
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155024 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>