Migrate ProcessesEventRouter to the new task manager

chrome/browser/task_management/providers/arc/arc_process_task.cc

Index: chrome/browser/task_management/providers/arc/arc_process_task.cc
diff --git a/chrome/browser/task_management/providers/arc/arc_process_task.cc b/chrome/browser/task_management/providers/arc/arc_process_task.cc
index 7ef3926bca54472e6b482232c36c551b569059c1..816757a4f4133cd668b206b481f43c558bd0da5b 100644
--- a/chrome/browser/task_management/providers/arc/arc_process_task.cc
+++ b/chrome/browser/task_management/providers/arc/arc_process_task.cc
@@ -8,6 +8,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/arc/arc_bridge_service.h"
+#include "content/public/common/child_process_host.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace task_management {
@@ -42,7 +43,7 @@ Task::Type ArcProcessTask::GetType() const {
 
 int ArcProcessTask::GetChildProcessUniqueID() const {
   // ARC process is not a child process of the browser.
-  return 0;
+  return content::ChildProcessHost::kInvalidUniqueID;
 }
 
 void ArcProcessTask::Kill() {