Unlink corrupt SimpleCache index files immediately after load.

net/disk_cache/simple/simple_index_file.cc

Index: net/disk_cache/simple/simple_index_file.cc
diff --git a/net/disk_cache/simple/simple_index_file.cc b/net/disk_cache/simple/simple_index_file.cc
index 529faf15a1ed1c71ecb6a616f3c5480134dfc2b6..319352080c2a339745c7e56637c7b59f426b3b93 100644
--- a/net/disk_cache/simple/simple_index_file.cc
+++ b/net/disk_cache/simple/simple_index_file.cc
@@ -178,10 +178,18 @@ scoped_ptr<SimpleIndex::EntrySet> SimpleIndexFile::LoadFromDisk(
   std::string contents;
   if (!file_util::ReadFileToString(index_filename, &contents)) {
     LOG(WARNING) << "Could not read Simple Index file.";
+    file_util::Delete(index_filename, false);
     return scoped_ptr<SimpleIndex::EntrySet>();
   }
 
-  return SimpleIndexFile::Deserialize(contents.data(), contents.size());
+  scoped_ptr<SimpleIndex::EntrySet> entries =
+      SimpleIndexFile::Deserialize(contents.data(), contents.size());
+  if (!entries) {
+    file_util::Delete(index_filename, false);
+    return scoped_ptr<SimpleIndex::EntrySet>();
+  }
+
+  return entries.Pass();
 }
 
 // static