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Following r841439 this change moves the logging of UTF16 strings from
base/strings/string16.h to base/logging.h. Since base::string16 is now
just a typedef for either std::u16string or std::wstring it is no longer
associated with the base namespace, and thus its operator<< need to live
in namespace std, so that it is found by ADL.

TBR=dcheng

Bug: 911896
Change-Id: I2f84da1ac084ec8440e671dd14d5aa9c30d98c44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632693
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845120}