TabManager: Kill background tabs before android (background) apps.

chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc

Index: chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc
diff --git a/chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc b/chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc
index 1fbefed6b3114f12f1de1f1c3d723b47353e3b5c..a91fcb401fb4ffe7f3ebac0da1ced52454251971 100644
--- a/chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc
+++ b/chrome/browser/resource_coordinator/tab_manager_delegate_chromeos.cc
@@ -675,12 +675,11 @@ void TabManagerDelegate::AdjustOomPrioritiesImpl(
   int range_middle =
       (chrome::kLowestRendererOomScore + chrome::kHighestRendererOomScore) / 2;
 
-  // Find some pivot point. For now processes with priority >= CHROME_INTERNAL
-  // are prone to be affected by LRU change. Taking them as "high priority"
-  // processes.
+  // Find some pivot point. For now (roughly) apps are in the first half and
+  // tabs are in the second half.
   auto lower_priority_part = candidates.end();
   for (auto it = candidates.begin(); it != candidates.end(); ++it) {
-    if (it->process_type() >= ProcessType::BACKGROUND_APP) {
+    if (it->process_type() >= ProcessType::BACKGROUND_TAB) {
       lower_priority_part = it;
       break;
     }