Move WebCacheMemoryDumpProvider to platform

third_party/WebKit/Source/core/fetch/WebCacheMemoryDumpProvider.h

-// Copyright 2015 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 WebCacheMemoryDumpProvider_h
-#define WebCacheMemoryDumpProvider_h
-
-#include "core/fetch/MemoryCache.h"
-#include "platform/heap/Handle.h"
-#include "public/platform/WebCommon.h"
-#include "public/platform/WebMemoryDumpProvider.h"
-#include "wtf/Allocator.h"
-
-namespace blink {
-
-// This class is wrapper around MemoryCache to take memory snapshots. It dumps
-// the stats of cache only after the cache is created.
-class CORE_EXPORT WebCacheMemoryDumpProvider final : public WebMemoryDumpProvider {
-    USING_FAST_MALLOC(WebCacheMemoryDumpProvider);
-public:
-    // This class is singleton since there is a global MemoryCache object.
-    static WebCacheMemoryDumpProvider* instance();
-    ~WebCacheMemoryDumpProvider() override;
-
-    // WebMemoryDumpProvider implementation.
-    bool onMemoryDump(WebMemoryDumpLevelOfDetail, WebProcessMemoryDump*) override;
-
-    void setMemoryCache(MemoryCache* memoryCache)
-    {
-        ASSERT(isMainThread());
-        m_memoryCache = memoryCache;
-    }
-
-private:
-    WebCacheMemoryDumpProvider();
-
-    WeakPersistent<MemoryCache> m_memoryCache;
-};
-
-} // namespace blink
-
-#endif // WebCacheMemoryDumpProvider_h