**STILLBAKING** Fix SimpleCache eviction performance.

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index ebd2f578ae578a2df3d50d7b20f2642d0d26aa4d..971a61e4162cabf51031ad8d954293386c20eba5 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -2944,8 +2944,10 @@ TEST_F(DiskCacheBackendTest, MemoryOnlyBackendEviction) {
   BackendEviction();
 }
 
-// TODO(gavinp): Enable BackendEviction test for simple cache after performance
-// problems are addressed. See crbug.com/588184 for more information.
+TEST_F(DiskCacheBackendTest, SimpleCacheBackendEviction) {
+  SetSimpleCacheMode();
+  BackendEviction();
+}
 
 TEST_F(DiskCacheTest, Backend_UsageStatsTimer) {
   MessageLoopHelper helper;