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SharedMemoryMapping::Unmap() call passes a mapping size to the munmap() or a
similar system call on some platforms. The actual size of a mapping is stored
in the SharedMemoryMapping::mapped_size_ but the SharedMemoryMapping::size_
which contains the logical size of the mapping has been mistakenly used instead.

This bug is not severe though because the mapped_size_/size_ mismatch exists
only on Windows and Windows system call for unmapping doesn't accept the size.

Change-Id: Id25c3dce6f0e2ea78d885e76e936572d4e5d2d52
Reviewed-on: https://chromium-review.googlesource.com/1241054Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593695}