Make DiskCacheTest.MultipleInstances pass in net_unittests on Windows 64-bit

net/disk_cache/trace.cc

 // Copyright (c) 2011 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.
 
 #include "net/disk_cache/trace.h"
 
 #include <stdio.h>
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/logging.h"
 #include "net/disk_cache/stress_support.h"
 
 // Change this value to 1 to enable tracing on a release build. By default,
 // tracing is enabled only on debug builds.
 #define ENABLE_TRACING 0
 
 #ifndef NDEBUG
 #undef ENABLE_TRACING
 #define ENABLE_TRACING 1
 #endif
 
 namespace {
 
-const int kEntrySize = 48;
+const int kEntrySize = 12 * sizeof(size_t);
 #if defined(NET_BUILD_STRESS_CACHE)
 const int kNumberOfEntries = 500000;
 #else
-const int kNumberOfEntries = 5000;  // 240 KB.
+const int kNumberOfEntries = 5000;  // 240 KB on 32bit, 480 KB on 64bit
 #endif
 
 bool s_trace_enabled = false;
 
 struct TraceBuffer {
   int num_traces;
   int current;
   char buffer[kNumberOfEntries][kEntrySize];
 };
 
@@ skipping 129 matching lines @@
 void DestroyTrace(void) {
   s_trace_object = NULL;
 }
 
 void Trace(const char* format, ...) {
 }
 
 #endif  // ENABLE_TRACING
 
 }  // namespace disk_cache