Coverity: Pass parameters by reference.

chrome/browser/extensions/extension_processes_api.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_processes_api.h"
 
 #include "base/callback.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/task.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_processes_api_constants.h"
 #include "chrome/browser/extensions/extension_tabs_module.h"
 #include "chrome/browser/extensions/extension_tabs_module_constants.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/notification_type.h"
 
 namespace keys = extension_processes_api_constants;
 
 DictionaryValue* CreateProcessValue(int process_id,
-                                    std::string type,
+                                    const std::string& type,
                                     double cpu,
                                     int64 net,
                                     int64 pr_mem,
                                     int64 sh_mem) {
   DictionaryValue* result = new DictionaryValue();
   result->SetInteger(keys::kIdKey, process_id);
   result->SetString(keys::kTypeKey, type);
   result->SetDouble(keys::kCpuKey, cpu);
   result->SetDouble(keys::kNetworkKey, static_cast<double>(net));
   result->SetDouble(keys::kPrivateMemoryKey, static_cast<double>(pr_mem));
@@ skipping 128 matching lines @@
         base::IntToString(tab_id));
     return false;
   }
 
   // Return the process ID of the tab as an integer.
   int id = base::GetProcId(contents->tab_contents()->
       GetRenderProcessHost()->GetHandle());
   result_.reset(Value::CreateIntegerValue(id));
   return true;
 }