Reduce string copies in GURL creation

content/renderer/media/user_media_client_impl.cc

Index: content/renderer/media/user_media_client_impl.cc
diff --git a/content/renderer/media/user_media_client_impl.cc b/content/renderer/media/user_media_client_impl.cc
index 204e631a90d1ae58ae047178755b3abc4b73136b..d575ada115df15870fa07ecebe4de300c8b4c015 100644
--- a/content/renderer/media/user_media_client_impl.cc
+++ b/content/renderer/media/user_media_client_impl.cc
@@ -17,6 +17,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
+#include "content/public/child/url_conversion.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/media/media_stream.h"
 #include "content/renderer/media/media_stream_audio_source.h"
@@ -223,7 +224,8 @@ void UserMediaClientImpl::requestUserMedia(
     }
     CopyBlinkRequestToStreamControls(user_media_request, &controls);
 
-    security_origin = GURL(user_media_request.securityOrigin().toString());
+    security_origin =
+        WebStringToGURL(user_media_request.securityOrigin().toString());
     DCHECK(render_frame()->GetWebFrame() ==
                static_cast<blink::WebFrame*>(
                    user_media_request.ownerDocument().frame()));
@@ -302,8 +304,10 @@ void UserMediaClientImpl::requestMediaDevices(
   // underlying pointer is null). In order to use this function in a test we
   // need to check if it isNull.
   GURL security_origin;
-  if (!media_devices_request.isNull())
-    security_origin = GURL(media_devices_request.securityOrigin().toString());
+  if (!media_devices_request.isNull()) {
+    security_origin =
+        WebStringToGURL(media_devices_request.securityOrigin().toString());
+  }
 
   DVLOG(1) << "UserMediaClientImpl::requestMediaDevices("
            << audio_input_request_id