Revert of Add ChildMemoryCoordinator::PurgeMemory()

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index ab4f08aa972516ff65657aa006a1b3fa2882a3eb..f05ef8d24efce6140f5b5353dbb148c5230d384a 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1662,7 +1662,9 @@ void RenderThreadImpl::OnProcessPurgeAndSuspend() {
     return;
 
   if (base::FeatureList::IsEnabled(features::kPurgeAndSuspend)) {
-    memory_coordinator_->PurgeMemory();
+    // TODO(tasak): After enabling MemoryCoordinator, remove this Notify
+    // and follow MemoryCoordinator's request.
+    base::MemoryCoordinatorClientRegistry::GetInstance()->PurgeMemory();
   }
   // Since purging is not a synchronous task (e.g. v8 GC, oilpan GC, ...),
   // we need to wait until the task is finished. So wait 15 seconds and