Add std::string constructors for Origin/SchemeHostPort to reduce copies

url/scheme_host_port.h

Index: url/scheme_host_port.h
diff --git a/url/scheme_host_port.h b/url/scheme_host_port.h
index 065e4aa6059c2e3f887d0518071ad9ac74b8b2cf..b2e030dfff21c9e6d7308ba6d1940c86fe923c6d 100644
--- a/url/scheme_host_port.h
+++ b/url/scheme_host_port.h
@@ -96,8 +96,8 @@ class URL_EXPORT SchemeHostPort {
   // that the host and port are canonicalized. This should only be used when
   // converting between already normalized types, and should NOT be used for
   // IPC.
-  SchemeHostPort(base::StringPiece scheme,
-                 base::StringPiece host,
+  SchemeHostPort(std::string scheme,
+                 std::string host,
                  uint16_t port,
                  ConstructPolicy policy);