Convert implicit scoped_refptr constructor calls to explicit ones, part 1

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index 12ff5c0ed5f306620b01d9d798a65b3b6de80a53..c4e07995ae79d89510f9e7f1058ff05e5d35d837 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -254,8 +254,8 @@ RenderProcessHost* ExtensionProcessManager::GetExtensionProcess(
     const GURL& url) {
   if (!browsing_instance_->HasSiteInstance(url))
     return NULL;
-  scoped_refptr<SiteInstance> site =
-      browsing_instance_->GetSiteInstanceForURL(url);
+  scoped_refptr<SiteInstance> site(
+      browsing_instance_->GetSiteInstanceForURL(url));
   if (site->HasProcess())
     return site->GetProcess();
   return NULL;