Revert of offset namespace ids

content/browser/dom_storage/dom_storage_context_impl.cc

Index: content/browser/dom_storage/dom_storage_context_impl.cc
diff --git a/content/browser/dom_storage/dom_storage_context_impl.cc b/content/browser/dom_storage/dom_storage_context_impl.cc
index 7e9d16e65be54c6866f9ffea82f068bb5a322808..db9681cfe72208acbdc22d1d61366e12fbfaad82 100644
--- a/content/browser/dom_storage/dom_storage_context_impl.cc
+++ b/content/browser/dom_storage/dom_storage_context_impl.cc
@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 #include "content/browser/dom_storage/dom_storage_context_impl.h"
-
-#include <stdlib.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ -28,10 +26,6 @@
 
 static const int kSessionStoraceScavengingSeconds = 60;
 
-// Offset the session storage namespace ids generated by different contexts
-// to help identify when an id from one is mistakenly used in another.
-static int g_session_id_offset_sequence = 0;
-
 DOMStorageContextImpl::DOMStorageContextImpl(
     const base::FilePath& localstorage_directory,
     const base::FilePath& sessionstorage_directory,
@@ -40,7 +34,6 @@
     : localstorage_directory_(localstorage_directory),
       sessionstorage_directory_(sessionstorage_directory),
       task_runner_(task_runner),
-      session_id_offset_(abs((g_session_id_offset_sequence++ % 10)) * 1000),
       is_shutdown_(false),
       force_keep_session_state_(false),
       special_storage_policy_(special_storage_policy),
@@ -234,10 +227,6 @@
       OnDOMStorageAreaCleared(area, page_url));
 }
 
-int64 DOMStorageContextImpl::AllocateSessionId() {
-  return session_id_sequence_.GetNext() + session_id_offset_;
-}
-
 std::string DOMStorageContextImpl::AllocatePersistentSessionId() {
   std::string guid = base::GenerateGUID();
   std::replace(guid.begin(), guid.end(), '-', '_');