Clean up CPDF_Stream.

Replace the CPDF_Stream(nullptr, 0, nullptr) pattern with
a default ctor.

Remove unused parameters from CPDF_Stream::SetData(). Both
are always passed as FALSE.

CPDF_Stream declared its own m_GenNum, which shadowed the one
in CPDF_Object. It was used only to distinguish file/memory
streams, so add a bool explicitly for this purpose.

Remove the union, it would be sad if we confused user data
with a C++ object with virtual function calls.

Use unique_ptrs with appropriate deleters to manage memory.

Review-Url: https://codereview.chromium.org/2347993002

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