gin: Add out-of-line copy ctors for complex classes.

This patch adds out of line copy constructors for classes that our
clang-plugin considers heavy. This is an effort to enable copy
constructor checks by default.

BUG=436357
R=aa@chromium.org, dcheng@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/1727063002

Cr-Commit-Position: refs/heads/master@{#377655}
4 files changed