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This change prepares //mojo and //ipc for the upcoming switch of
base::string16 to std::u16string by replacing current Windows only
usages of base::string16 with std::wstring. Furthermore, it adds a
std::wstring specialization of IPC::ParamTraits.

Bug: 911896
Change-Id: If09078ba43a381f7210f89bba04a729024812d1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572842Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834355}