memory_coordinator: Discard tabs under critical memory condition

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 b689350325b807a0276cac709e4e4fa3d2054980..69001b94fe9e4826add60f039c60bf50b5675fad 100644
--- a/chrome/browser/memory/tab_manager.cc
+++ b/chrome/browser/memory/tab_manager.cc
@@ -350,15 +350,15 @@ bool TabManager::CanDiscardTab(int64_t target_web_contents_id) const {
   return true;
 }
 
-void TabManager::DiscardTab() {
+bool TabManager::DiscardTab() {
 #if defined(OS_CHROMEOS)
   // Call Chrome OS specific low memory handling process.
   if (base::FeatureList::IsEnabled(features::kArcMemoryManagement)) {
     delegate_->LowMemoryKill(GetUnsortedTabStats());
-    return;
+    return false;
   }
 #endif
-  DiscardTabImpl();
+  return DiscardTabImpl() != nullptr;
 }
 
 WebContents* TabManager::DiscardTabById(int64_t target_web_contents_id) {