Make ProtocolHandlerRegistry use 307 to redirect instead of 302.

chrome/browser/custom_handlers/protocol_handler_registry.cc

Index: chrome/browser/custom_handlers/protocol_handler_registry.cc
diff --git a/chrome/browser/custom_handlers/protocol_handler_registry.cc b/chrome/browser/custom_handlers/protocol_handler_registry.cc
index a95fd1c285665acdca3f8715d87f2ed593ded451..b882c7ceb8a1eaaca4dd3a511c600e73027df4a2 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry.cc
+++ b/chrome/browser/custom_handlers/protocol_handler_registry.cc
@@ -152,7 +152,7 @@ net::URLRequestJob* ProtocolHandlerRegistry::Core::MaybeCreateJob(
 
   return new net::URLRequestRedirectJob(
       request, network_delegate, translated_url,
-      net::URLRequestRedirectJob::REDIRECT_302_FOUND);
+      net::URLRequestRedirectJob::REDIRECT_307_TEMPORARY_REDIRECT);
 }
 
 // URLInterceptor ------------------------------------------------------------