[tracing] Fix accounting of WebCache memory statistics

Source/core/fetch/MemoryCache.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
@@ skipping 119 matching lines @@
 namespace blink {
 
 class CORE_EXPORT MemoryCache final : public GarbageCollectedFinalized<MemoryCache>, public WebThread::TaskObserver {
     WTF_MAKE_NONCOPYABLE(MemoryCache);
 public:
     static MemoryCache* create();
     ~MemoryCache();
     DECLARE_TRACE();
 
     struct TypeStatistic {
-        int count;
-        int size;
-        int liveSize;
-        int decodedSize;
-        int encodedSize;
-        int encodedSizeDuplicatedInDataURLs;
-        int purgeableSize;
-        int purgedSize;
+        size_t count;
+        size_t size;
+        size_t liveSize;
+        size_t decodedSize;
+        size_t encodedSize;
+        size_t encodedSizeDuplicatedInDataURLs;
+        size_t purgeableSize;
+        size_t purgedSize;
 
         TypeStatistic()
             : count(0)
             , size(0)
             , liveSize(0)
             , decodedSize(0)
             , encodedSize(0)
             , encodedSizeDuplicatedInDataURLs(0)
             , purgeableSize(0)
             , purgedSize(0)
@@ skipping 164 matching lines @@
 // Returns the global cache.
 CORE_EXPORT MemoryCache* memoryCache();
 
 // Sets the global cache, used to swap in a test instance. Returns the old
 // MemoryCache object.
 CORE_EXPORT MemoryCache* replaceMemoryCacheForTesting(MemoryCache*);
 
 }
 
 #endif