Disk Cache: Improve handling of dirty entries.

net/disk_cache/block_files.cc

Index: net/disk_cache/block_files.cc
===================================================================
--- net/disk_cache/block_files.cc	(revision 102424)
+++ net/disk_cache/block_files.cc	(working copy)
@@ -287,15 +287,15 @@
 
   Trace("DeleteBlock 0x%x", address.value());
 
-  BlockFileHeader* header = reinterpret_cast<BlockFileHeader*>(file->buffer());
-  DeleteMapBlock(address.start_block(), address.num_blocks(), header);
-
   size_t size = address.BlockSize() * address.num_blocks();
   size_t offset = address.start_block() * address.BlockSize() +
                   kBlockHeaderSize;
   if (deep)
     file->Write(zero_buffer_, size, offset);
 
+  BlockFileHeader* header = reinterpret_cast<BlockFileHeader*>(file->buffer());
+  DeleteMapBlock(address.start_block(), address.num_blocks(), header);
+
   if (!header->num_entries) {
     // This file is now empty. Let's try to delete it.
     FileType type = Addr::RequiredFileType(header->entry_size);