Coverity: Fix a few pass-by-values.

ppapi/native_client/src/trusted/plugin/service_runtime.cc

Index: ppapi/native_client/src/trusted/plugin/service_runtime.cc
diff --git a/ppapi/native_client/src/trusted/plugin/service_runtime.cc b/ppapi/native_client/src/trusted/plugin/service_runtime.cc
index f396a38ada0a90fbc3570c071fa6a0f88d69cef3..582da3b3de4966cad7a62f340dcc0fe76a234e9e 100644
--- a/ppapi/native_client/src/trusted/plugin/service_runtime.cc
+++ b/ppapi/native_client/src/trusted/plugin/service_runtime.cc
@@ -466,9 +466,8 @@ void PluginReverseInterface::QuotaRequest_MainThreadResponse(
   // request automatically deleted
 }
 
-int64_t PluginReverseInterface::RequestQuotaForWrite(nacl::string file_id,
-                                                     int64_t offset,
-                                                     int64_t bytes_to_write) {
+int64_t PluginReverseInterface::RequestQuotaForWrite(
+    const nacl::string& file_id, int64_t offset, int64_t bytes_to_write) {

[groby-ooo-7-16, 2012/02/22 21:29:24]

Please fix corresponding header

[James Hawkins, 2012/03/04 02:04:29]

Done.

   NaClLog(4,
           "PluginReverseInterface::RequestQuotaForWrite:"
           " (file_id='%s', offset=%"NACL_PRId64", bytes_to_write=%"