[QUIC] Remove using from headers and make git cl lint happy.
Using directives:
* Remove using std::string, std::list, and base::StringPiece directives from
header files.
* Add namespace qualifiers to string, list, and StringPiece in .cc files
(or add using directives where it makes sense).
* Move using directives consistently after #includes and before namespace.
git cl lint:
* #include std headers that are used.
* Fix #include orders.
* Remove two unnecessary semicolons and add one space.
* Add explicit qualifier to a constructor with one argument.
* Remove explicit qualifier from a constructor with zero arguments.
* Add argument name to one method declaration.
* Use static_cast<> instead of C-style cast.
* Fix one header guard closing #endif comment.
This CL lands server change 118254530 by bnc.
Review URL: https://codereview.chromium.org/1839523002
Cr-Commit-Position: refs/heads/master@{#384899}
34 files changed
