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This CL makes the following cleanup changes to
render_process_host_impl.h and .cc:
* remove DISALLOW_COPY_AND_ASSIGN
* replace empty constructor body with `= default;`
* use range-based for loop where possible
* replace .reset() with std::make_unique
* add missing `#include <memory>` (used for unique_ptr)

Change-Id: I074ec44ba1451851e00f0d6d480f20df004636f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601282Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#839196}