Run the disk cache tests in scoped temporary directories instead of a fixed directory so that they …

net/disk_cache/stress_cache.cc

Index: net/disk_cache/stress_cache.cc
===================================================================
--- net/disk_cache/stress_cache.cc	(revision 151735)
+++ net/disk_cache/stress_cache.cc	(working copy)
@@ -101,8 +101,11 @@
 void StressTheCache(int iteration) {
   int cache_size = 0x2000000;  // 32MB.
   uint32 mask = 0xfff;  // 4096 entries.
-  FilePath path = GetCacheFilePath().InsertBeforeExtensionASCII("_stress");
 
+  FilePath path;
+  PathService::Get(base::DIR_TEMP, &path);
+  path = path.AppendASCII("cache_test_stress");
+
   base::Thread cache_thread("CacheThread");
   if (!cache_thread.StartWithOptions(
           base::Thread::Options(MessageLoop::TYPE_IO, 0)))