Revert 152360 - Disk cache: Disable checking the lists on start-up.

This cl is intended for the beta channel.

BUG=143743
TEST=none
TBR=gavinp@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10837341

TBR=rvargas@google.com
Review URL: https://chromiumcodereview.appspot.com/10854230

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152364 0039d316-1c4b-4281-b951-d872f2087c98

net/disk_cache/backend_impl.cc

@@ -486,6 +486,9 @@ int BackendImpl::SyncInit() {
 
   disabled_ = !rankings_.Init(this, new_eviction_);
 
+  if (!disabled_ && !(user_flags_ & kNoRandom) && base::RandInt(0, 99) < 2)
+    rankings_.SelfCheck();  // Ignore return value for now.
+
 #if defined(STRESS_CACHE_EXTENDED_VALIDATION)
   trace_object_->EnableTracing(false);
   int sc = SelfCheck();