net: 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
[email protected], [email protected], [email protected]

Review URL: https://codereview.chromium.org/1728333003

Cr-Commit-Position: refs/heads/master@{#377976}
diff --git a/net/server/http_server_request_info.cc b/net/server/http_server_request_info.cc
index 07c15a54..765ddc0 100644
--- a/net/server/http_server_request_info.cc
+++ b/net/server/http_server_request_info.cc
@@ -11,6 +11,9 @@
 
 HttpServerRequestInfo::HttpServerRequestInfo() {}
 
+HttpServerRequestInfo::HttpServerRequestInfo(
+    const HttpServerRequestInfo& other) = default;
+
 HttpServerRequestInfo::~HttpServerRequestInfo() {}
 
 std::string HttpServerRequestInfo::GetHeaderValue(