Reduce string copies in GURL creation

content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc

Index: content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
diff --git a/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc b/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
index 8d24724d434ffa717ee355eb998a1f6bd63a394e..e61cfd59e0e93ce51526582d45fbd7fbf23ee563 100644
--- a/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
+++ b/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
@@ -7,6 +7,7 @@
 
 #include <utility>
 
+#include "content/public/child/url_conversion.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/pepper/pepper_webplugin_impl.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ -36,7 +37,8 @@ scoped_ptr<PepperCdmWrapper> PepperCdmWrapperImpl::Create(
   // Note: The code will continue after navigation to the "same" origin, even
   // though the CDM is no longer necessary.
   // TODO: Consider avoiding this possibility entirely. http://crbug.com/575236
-  GURL frame_security_origin(frame->securityOrigin().toString());
+  GURL frame_security_origin(
+      WebStringToGURL(frame->securityOrigin().toString()));
   if (frame_security_origin != security_origin) {
     LOG(ERROR) << "Frame has a different origin than the EME call.";
     return scoped_ptr<PepperCdmWrapper>();