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

LayoutTests/fast/mediastream/RTCIceCandidate-expected.txt

Index: LayoutTests/fast/mediastream/RTCIceCandidate-expected.txt
diff --git a/LayoutTests/fast/mediastream/RTCIceCandidate-expected.txt b/LayoutTests/fast/mediastream/RTCIceCandidate-expected.txt
deleted file mode 100644
index ea0a720cceaa324017ece3d5fec5ea824787e456..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/mediastream/RTCIceCandidate-expected.txt
+++ /dev/null
@@ -1,26 +0,0 @@
-Tests RTCIceCandidate.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-PASS candidate = new RTCIceCandidate(initializer); did not throw exception.
-PASS candidate.candidate is "foo"
-PASS candidate.sdpMid is "bar"
-PASS candidate.sdpMLineIndex is 6
-PASS initializer = JSON.parse(JSON.stringify(candidate)); did not throw exception.
-PASS candidate = new RTCIceCandidate(initializer); did not throw exception.
-PASS candidate.candidate is "foo"
-PASS candidate.sdpMid is "bar"
-PASS candidate.sdpMLineIndex is 6
-PASS new RTCIceCandidate({}); threw exception TypeMismatchError: Failed to construct 'RTCIceCandidate': The 'candidate' property is not a string, or is empty..
-PASS new RTCIceCandidate(5); threw exception TypeError: Failed to construct 'RTCIceCandidate': parameter 1 ('dictionary') is not an object..
-PASS new RTCIceCandidate("foobar"); threw exception TypeError: Failed to construct 'RTCIceCandidate': parameter 1 ('dictionary') is not an object..
-PASS new RTCIceCandidate({candidate:""}); threw exception TypeMismatchError: Failed to construct 'RTCIceCandidate': The 'candidate' property is not a string, or is empty..
-PASS new RTCIceCandidate({candidate:"x"}); did not throw exception.
-PASS candidate.candidate is "bar"
-PASS candidate.sdpMid is "foo"
-PASS candidate.sdpMLineIndex is 0
-PASS successfullyParsed is true
-
-TEST COMPLETE
-