TabManagerDelegate: Better prioritize ARC processes.

chrome/browser/memory/tab_manager.cc

Index: chrome/browser/memory/tab_manager.cc
diff --git a/chrome/browser/memory/tab_manager.cc b/chrome/browser/memory/tab_manager.cc
index a90170dfa02caf8b073eff7e665c4665834c50a2..d8ae87d81dbacae1893905ced127f76b886bffb7 100644
--- a/chrome/browser/memory/tab_manager.cc
+++ b/chrome/browser/memory/tab_manager.cc
@@ -727,7 +727,8 @@ TabManager::WebContentsData* TabManager::GetWebContentsData(
 }
 
 // static
-bool TabManager::CompareTabStats(TabStats first, TabStats second) {
+bool TabManager::CompareTabStats(const TabStats& first,
+                                 const TabStats& second) {
   // Being currently selected is most important to protect.
   if (first.is_selected != second.is_selected)
     return first.is_selected;