Reduce string copies in GURL creation

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index e67a0523e688c8ced4ac3ba2a03123c2c108f04f..0c64a22808abc91050bb7ea9c978aeba4d66a2f8 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -17,6 +17,7 @@
 #include "content/common/site_isolation_policy.h"
 #include "content/common/swapped_out_messages.h"
 #include "content/common/view_messages.h"
+#include "content/public/child/url_conversion.h"
 #include "content/renderer/child_frame_compositing_helper.h"
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_thread_impl.h"
@@ -431,7 +432,8 @@ void RenderFrameProxy::navigate(const blink::WebURLRequest& request,
   FrameHostMsg_OpenURL_Params params;
   params.url = request.url();
   params.referrer = Referrer(
-      GURL(request.httpHeaderField(blink::WebString::fromUTF8("Referer"))),
+      WebStringToGURL(
+          request.httpHeaderField(blink::WebString::fromUTF8("Referer"))),
       request.referrerPolicy());
   params.disposition = CURRENT_TAB;
   params.should_replace_current_entry = should_replace_current_entry;