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This change applies clang-tidy's modernize-use-auto [1] in /remoting.
This change does not rewrite new and cast expressions.

Reproduction steps:
- run clang-tidy's modernize-use-auto
- run git cl format
- manually remove unused typedefs due to -Wunused-local-typedef error

[1] https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-auto.html

This CL was uploaded by git cl split.

R=joedow@chromium.org

Bug: 890902
Change-Id: Ib36073c54837ccd92347d202b539cef688d8402a
Reviewed-on: https://chromium-review.googlesource.com/c/1257908Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595974}