Cleanup of static lists of schemes & origins that are created at startup.

content/public/common/content_client.cc

Index: content/public/common/content_client.cc
diff --git a/content/public/common/content_client.cc b/content/public/common/content_client.cc
index 43cede30c6af2cb588a700671b64f17a773bfa4e..c58673f0785c6827a53a2a3e19426f7b91ee3327 100644
--- a/content/public/common/content_client.cc
+++ b/content/public/common/content_client.cc
@@ -61,6 +61,9 @@ ContentUtilityClient* SetUtilityClientForTesting(ContentUtilityClient* u) {
   return InternalTestInitializer::SetUtility(u);
 }
 
+ContentClient::Schemes::Schemes() = default;
+ContentClient::Schemes::~Schemes() = default;
+
 ContentClient::ContentClient()
     : browser_(NULL),
       gpu_(NULL),