Set DOM Storage buffer size so that not everything ends up in RAM

content/browser/dom_storage/session_storage_database.cc

Index: content/browser/dom_storage/session_storage_database.cc
diff --git a/content/browser/dom_storage/session_storage_database.cc b/content/browser/dom_storage/session_storage_database.cc
index ec246164e3404561df14a267ada5c019bd5ba941..0aea7c7cc34f11ec20da8372199eaf8871654305 100644
--- a/content/browser/dom_storage/session_storage_database.cc
+++ b/content/browser/dom_storage/session_storage_database.cc
@@ -383,6 +383,9 @@ leveldb::Status SessionStorageDatabase::TryToOpen(leveldb::DB** db) {
   options.max_open_files = 0;  // Use minimum.
   options.create_if_missing = true;
   options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
+  // Default write_buffer_size is 4 MB but that might leave a 3.999
+  // memory allocation in RAM from a log file recovery.
+  options.write_buffer_size = 64 * 1024;

[cmumford, 2016/02/03 21:34:51]

64K is the minimum, so this will work, but it will slow down db writes.
michaeln@ what impact on performance do you think this CL will have?

   return leveldb::DB::Open(options, file_path_.AsUTF8Unsafe(), db);
 }