Disk cache: Reset mask_ when the disk cache is being restarted....

net/disk_cache/backend_impl.cc

Index: net/disk_cache/backend_impl.cc
===================================================================
--- net/disk_cache/backend_impl.cc	(revision 17031)
+++ net/disk_cache/backend_impl.cc	(working copy)
@@ -788,6 +788,10 @@
   LogStats();
   ReportError(error);
 
+  // Reset the mask_ if it was not given by the user.
+  if (mask_ == data_->header.table_len - 1)
+    mask_ = 0;
+
   // Setting the index table length to an invalid value will force re-creation
   // of the cache files.
   data_->header.table_len = 1;
@@ -983,6 +987,10 @@
 }
 
 void BackendImpl::PrepareForRestart() {
+  // Reset the mask_ if it was not given by the user.
+  if (mask_ == data_->header.table_len - 1)
+    mask_ = 0;
+
   data_->header.crash = 0;
   index_ = NULL;
   data_ = NULL;