memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 1506ecf06f0346a10c7415cde00d725604a34303..6f5335d706ea571deb97587f764ce7fcac5b8084 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -512,7 +512,6 @@ class CONTENT_EXPORT RenderThreadImpl
   // ChildThread
   bool OnControlMessageReceived(const IPC::Message& msg) override;
   void OnProcessBackgrounded(bool backgrounded) override;
-  void OnProcessResume() override;
   void OnProcessPurgeAndSuspend() override;
   void RecordAction(const base::UserMetricsAction& action) override;
   void RecordComputedAction(const std::string& action) override;
@@ -521,6 +520,7 @@ class CONTENT_EXPORT RenderThreadImpl
 
   // base::MemoryCoordinatorClient implementation:
   void OnMemoryStateChange(base::MemoryState state) override;
+  void OnPurgeMemory() override;
 
   void ClearMemory();