Merge from Chromium at DEPS revision 240154

This commit was generated by merge_to_master.py.

Change-Id: I8f2ba858cf0e7f413dddedc2ae91dc37f7136c2e
diff --git a/sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc b/sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc
index 61e95d7..08a857a 100644
--- a/sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc
@@ -6,7 +6,7 @@
 #include "sandbox/linux/seccomp-bpf/syscall_iterator.h"
 #include "sandbox/linux/tests/unit_tests.h"
 
-using namespace playground2;
+namespace sandbox {
 
 namespace {
 
@@ -132,3 +132,5 @@
 }
 
 }  // namespace
+
+}  // namespace sandbox