Disk cache: Simplyfy some of the test infrastructure.

net/disk_cache/disk_cache_test_util.h

Index: net/disk_cache/disk_cache_test_util.h
===================================================================
--- net/disk_cache/disk_cache_test_util.h	(revision 109713)
+++ net/disk_cache/disk_cache_test_util.h	(working copy)
@@ -21,9 +21,6 @@
 // Deletes all file son the cache.
 bool DeleteCache(const FilePath& path);
 
-// Copies a set of cache files from the data folder to the test folder.
-bool CopyTestCache(const std::string& name);
-
 // Gets the path to the cache test folder.
 FilePath GetCacheFilePath();
 
@@ -40,7 +37,7 @@
 // exists and is clear in ctor and that the directory gets deleted in dtor.
 class ScopedTestCache {
  public:
-  ScopedTestCache();
+  explicit ScopedTestCache(const FilePath& path);
   // Use a specific folder name.
   explicit ScopedTestCache(const std::string& name);
   ~ScopedTestCache();