Cleanup: Better constify some strings in base.

base/threading/thread_id_name_manager_unittest.cc

Index: base/threading/thread_id_name_manager_unittest.cc
diff --git a/base/threading/thread_id_name_manager_unittest.cc b/base/threading/thread_id_name_manager_unittest.cc
index 37773018a0ebdfff1888ee11399aa1cf87f2077b..b5953d5d4d028505f67df11e68ba02ec48f5f1f0 100644
--- a/base/threading/thread_id_name_manager_unittest.cc
+++ b/base/threading/thread_id_name_manager_unittest.cc
@@ -13,8 +13,8 @@ typedef PlatformTest ThreadIdNameManagerTest;
 
 namespace {
 
-static const char* kAThread = "a thread";
-static const char* kBThread = "b thread";
+const char kAThread[] = "a thread";
+const char kBThread[] = "b thread";
 
 TEST_F(ThreadIdNameManagerTest, AddThreads) {
   base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();