[Next][Tizen] Use FileDescriptor(ScopedFD fd)

The upstream change will result can't find the right FileDescriptor to call.

CL: https://codereview.chromium.org/621613002
[Next][Tizen] WebMediaPlayerImpl constructor change

CL: https://codereview.chromium.org/636303002
Merge pull request #2724 from qjia7/compile_error

[Next][Tizen] Fix Compile error