Add more out of line copy ctors for complex classes.

mojo/shell/public/cpp/lib/capabilities.cc

Index: mojo/shell/public/cpp/lib/capabilities.cc
diff --git a/mojo/shell/public/cpp/lib/capabilities.cc b/mojo/shell/public/cpp/lib/capabilities.cc
index cc3fc1801941e4247f72af77f56bbacd268a16b7..26b42cb8f5d5b4f925244e28e5c0b2b9bda56af7 100644
--- a/mojo/shell/public/cpp/lib/capabilities.cc
+++ b/mojo/shell/public/cpp/lib/capabilities.cc
@@ -7,6 +7,7 @@
 namespace mojo {
 
 CapabilityRequest::CapabilityRequest() {}
+CapabilityRequest::CapabilityRequest(const CapabilityRequest& other) = default;
 CapabilityRequest::~CapabilityRequest() {}
 
 bool CapabilityRequest::operator==(const CapabilityRequest& other) const {
@@ -14,6 +15,7 @@ bool CapabilityRequest::operator==(const CapabilityRequest& other) const {
 }
 
 CapabilitySpec::CapabilitySpec() {}
+CapabilitySpec::CapabilitySpec(const CapabilitySpec& other) = default;
 CapabilitySpec::~CapabilitySpec() {}
 
 bool CapabilitySpec::operator==(const CapabilitySpec& other) const {