Revert "Fix the issue of video/audio playback with file://android_asset scheme."

This reverts commit acc604864805601678ff2381276e64ec8a05e71f.

It's cherry-picked from 2573df00bb.
[Android] Add Resource loading filter for MediaPlayer

Why: There are requirements to customize the MediaPlayer resource
loading on Android which is implemented in Chromium code base.
Till now we have two points:
    1) Support the file:///android_asset in MediaPlayer.
    2) Support app scheme in the resource loading of MediaPlayer.
Unfortunately, the resource loading of MediaPlayer on Andoid goes
a different way from other ports and no interface to handle this.

How: Add a new interface ResourceLoadingFilter to filter the resource
loading(setDataSource) in MediaPlayerBridge, which could be used in
xwalk to do the customization by overriding the function of
shouldOverrideResourceLoading() in xwalk.

BUG=https://crosswalk-project.org/jira/browse/XWALK-880

It's cherry-picked from 5b40c94411.
Merge pull request #123 from xingnan/crosswalk-4

Cherry-pick the audio issue fix from trunk