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Most of the include are obsolete. The remaining one can be removed
as all the code is compiled with ARC thus there is no need to have
a C++ smart pointer to call retain/release when the compiler can
do it automatically.

Bug: 1051997
Change-Id: I77b60876b2b1616ebc369a63e9e8562d5ec9f42d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2073884Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744670}