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Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 219129336

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218618184

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218571466

Remove all mention of TR1 tuple and our own implementation of tuple.

PiperOrigin-RevId: 216395043

Comments changes, no functionality changes. 

Comments changes, no functionality changes

Formatting changes for automatic code management

Formatting and a link

Fix warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss

merging, 

RE-Doing the merge, this time with gcc on mac in the PR so I can catch errors before merging the PR

yet more

warnings

cont - 2

more warnings

deal with MSVC warn, cont 1

Cont. deal with MCVS warnings

This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.