Complete removing Blink gyp files.

third_party/WebKit/Source/modules/mediasource/BUILD.gn

Index: third_party/WebKit/Source/modules/mediasource/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/mediasource/BUILD.gn b/third_party/WebKit/Source/modules/mediasource/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..ff18cd2a4dc4cc93c604a5babc18b63ed263f6fe
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediasource/BUILD.gn
@@ -0,0 +1,30 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("mediasource") {
+  sources = [
+    "HTMLVideoElementMediaSource.cpp",
+    "HTMLVideoElementMediaSource.h",
+    "MediaSource.cpp",
+    "MediaSource.h",
+    "MediaSourceRegistry.cpp",
+    "MediaSourceRegistry.h",
+    "SourceBuffer.cpp",
+    "SourceBuffer.h",
+    "SourceBufferList.cpp",
+    "SourceBufferList.h",
+    "SourceBufferTrackBaseSupplement.cpp",
+    "SourceBufferTrackBaseSupplement.h",
+    "TrackDefault.cpp",
+    "TrackDefault.h",
+    "TrackDefaultList.cpp",
+    "TrackDefaultList.h",
+    "URLMediaSource.cpp",
+    "URLMediaSource.h",
+    "VideoPlaybackQuality.cpp",
+    "VideoPlaybackQuality.h",
+  ]
+}