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

remoting/test/host_info.cc

Index: remoting/test/host_info.cc
diff --git a/remoting/test/host_info.cc b/remoting/test/host_info.cc
index 1370011a4a97871e8e603c35dd266c47758e7e15..4be97e1c1f3e9b6876b80390e982b835e0813869 100644
--- a/remoting/test/host_info.cc
+++ b/remoting/test/host_info.cc
@@ -13,6 +13,8 @@ namespace test {
 HostInfo::HostInfo() {
 }
 
+HostInfo::HostInfo(const HostInfo& other) = default;
+
 HostInfo::~HostInfo() {
 }