Move MediaStream and MediaStreamTrack implementation from modules/mediastream to core/mediastream.

LayoutTests/fast/mediastream/RTCSessionDescription-expected.txt

Index: LayoutTests/fast/mediastream/RTCSessionDescription-expected.txt
diff --git a/LayoutTests/fast/mediastream/RTCSessionDescription-expected.txt b/LayoutTests/fast/mediastream/RTCSessionDescription-expected.txt
deleted file mode 100644
index eb8b569f52ec10dd00fc37fd1b5e09e55bf3597e..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/mediastream/RTCSessionDescription-expected.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-Tests RTCSessionDescription.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-PASS sessionDescription = new RTCSessionDescription(initializer); did not throw exception.
-PASS sessionDescription.type is "offer"
-PASS sessionDescription.sdp is "foobar"
-PASS initializer = JSON.parse(JSON.stringify(sessionDescription)); did not throw exception.
-PASS sessionDescription = new RTCSessionDescription(initializer); did not throw exception.
-PASS sessionDescription.type is "offer"
-PASS sessionDescription.sdp is "foobar"
-PASS new RTCSessionDescription(); did not throw exception.
-PASS new RTCSessionDescription({}); did not throw exception.
-PASS new RTCSessionDescription(5); threw exception TypeError: Failed to construct 'RTCSessionDescription': parameter 1 ('descriptionInitDict') is not an object..
-PASS new RTCSessionDescription('foobar'); threw exception TypeError: Failed to construct 'RTCSessionDescription': parameter 1 ('descriptionInitDict') is not an object..
-PASS new RTCSessionDescription({type:'foobar', sdp:'x'}); threw exception TypeMismatchError: Failed to construct 'RTCSessionDescription': Illegal value of attribute 'type' : foobar.
-PASS new RTCSessionDescription({type:'offer', sdp:''}); did not throw exception.
-PASS new RTCSessionDescription({type:'offer', sdp:'x'}); did not throw exception.
-PASS new RTCSessionDescription({type:'answer', sdp:'x'}); did not throw exception.
-PASS new RTCSessionDescription({type:'pranswer', sdp:'x'}); did not throw exception.
-PASS successfullyParsed is true
-
-TEST COMPLETE
-