Move CursorList to its own file.

third_party/WebKit/Source/core/style/CursorList.h

Index: third_party/WebKit/Source/core/style/CursorList.h
diff --git a/third_party/WebKit/Source/core/style/CursorList.h b/third_party/WebKit/Source/core/style/CursorList.h
new file mode 100644
index 0000000000000000000000000000000000000000..bc4b297f0d3ee5a1d3456f01c8223445050bb81c
--- /dev/null
+++ b/third_party/WebKit/Source/core/style/CursorList.h
@@ -0,0 +1,17 @@
+// Copyright 2017 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.
+
+#ifndef CursorList_h
+#define CursorList_h
+
+#include "core/style/CursorData.h"
+#include "platform/heap/HeapAllocator.h"
+
+namespace blink {
+
+typedef HeapVector<CursorData> CursorList;
+
+}  // namespace blink
+
+#endif  // CursorList_h