memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/browser/dom_storage/dom_storage_context_wrapper.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 72 matching lines @@
   friend class base::RefCountedThreadSafe<DOMStorageContextWrapper>;
 
   ~DOMStorageContextWrapper() override;
   DOMStorageContextImpl* context() const { return context_.get(); }
 
   // Called on UI thread when the system is under memory pressure.
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   // base::MemoryCoordinatorClient implementation:
-  void OnMemoryStateChange(base::MemoryState state) override;
+  void OnPurgeMemory() override;
 
   void PurgeMemory(DOMStorageContextImpl::PurgeOption purge_option);
 
   void GotMojoLocalStorageUsage(GetLocalStorageUsageCallback callback,
                                 std::vector<LocalStorageUsageInfo> usage);
 
   // Keep all mojo-ish details together and not bleed them through the public
   // interface.
   std::unique_ptr<LocalStorageContextMojo> mojo_state_;
 
   // To receive memory pressure signals.
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   scoped_refptr<DOMStorageContextImpl> context_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageContextWrapper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_WRAPPER_H_