Initialize the simple cache backend at runtime.

net/disk_cache/disk_cache_test_base.cc

Index: net/disk_cache/disk_cache_test_base.cc
===================================================================
--- net/disk_cache/disk_cache_test_base.cc	(revision 188696)
+++ net/disk_cache/disk_cache_test_base.cc	(working copy)
@@ -10,6 +10,7 @@
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/backend_impl.h"
+#include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "net/disk_cache/mem_backend_impl.h"
 
@@ -67,6 +68,7 @@
   if (mask_ || new_eviction_)
     implementation_ = true;
 
+  // TODO(pasko,gavinp): run tests with Simple Cache as well.
   if (memory_only_)
     InitMemoryCache();
   else
@@ -268,9 +270,10 @@
                             cache_thread_.message_loop_proxy();
 
   net::TestCompletionCallback cb;
-  int rv = disk_cache::BackendImpl::CreateBackend(
-               cache_path_, force_creation_, size_, type_,
-               disk_cache::kNoRandom, thread, NULL, &cache_, cb.callback());
+  int rv = disk_cache::CreateCacheBackendWithFlags(type_, cache_path_, size_,
+      force_creation_, disk_cache::kNoRandom, thread, NULL, &cache_,
+      cb.callback());
+
   ASSERT_EQ(net::OK, cb.GetResult(rv));
 }