Disk cache: fix a unit test for Linux....

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
===================================================================
--- net/disk_cache/backend_unittest.cc	(revision 45878)
+++ net/disk_cache/backend_unittest.cc	(working copy)
@@ -241,12 +241,10 @@
   MessageLoop::current()->RunAllPending();
 }
 
-#if defined(OS_WIN) || defined(OS_MACOSX)
-// This test fails on linux. TODO(rvargas): Find out why (bug 41563).
 TEST_F(DiskCacheTest, TruncatedIndex) {
   FilePath path = GetCacheFilePath();
   ASSERT_TRUE(DeleteCache(path));
-  FilePath index = path.AppendASCII("Index");
+  FilePath index = path.AppendASCII("index");
   ASSERT_EQ(5, file_util::WriteFile(index, "hello", 5));
   scoped_ptr<disk_cache::Backend> backend;
   backend.reset(disk_cache::BackendImpl::CreateBackend(path, false, 0,
@@ -254,7 +252,6 @@
                                                        disk_cache::kNone));
   ASSERT_TRUE(backend.get() == NULL);
 }
-#endif
 
 void DiskCacheBackendTest::BackendSetSize() {
   SetDirectMode();