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

chrome/browser/site_details.cc

Index: chrome/browser/site_details.cc
diff --git a/chrome/browser/site_details.cc b/chrome/browser/site_details.cc
index 4624ef5cefddeb430c439ecef00c2faf7306ae59..44ed5e9f5e6b77fc6eacc5bbc1b0acd44d1c2935 100644
--- a/chrome/browser/site_details.cc
+++ b/chrome/browser/site_details.cc
@@ -84,14 +84,22 @@ content::SiteInstance* DeterminePrimarySiteInstance(
 
 ScenarioBrowsingInstanceInfo::ScenarioBrowsingInstanceInfo() {}
 
+ScenarioBrowsingInstanceInfo::ScenarioBrowsingInstanceInfo(
+    const ScenarioBrowsingInstanceInfo& other) = default;
+
 ScenarioBrowsingInstanceInfo::~ScenarioBrowsingInstanceInfo() {}
 
 BrowsingInstanceInfo::BrowsingInstanceInfo() {}
 
+BrowsingInstanceInfo::BrowsingInstanceInfo(const BrowsingInstanceInfo& other) =
+    default;
+
 BrowsingInstanceInfo::~BrowsingInstanceInfo() {}
 
 IsolationScenario::IsolationScenario() {}
 
+IsolationScenario::IsolationScenario(const IsolationScenario& other) = default;
+
 IsolationScenario::~IsolationScenario() {}
 
 SiteData::SiteData() {
@@ -99,6 +107,8 @@ SiteData::SiteData() {
     scenarios[i].policy = static_cast<IsolationScenarioType>(i);
 }
 
+SiteData::SiteData(const SiteData& other) = default;
+
 SiteData::~SiteData() {}
 
 SiteDetails::SiteDetails() {}