replace COMPILE_ASSERT with static_assert in sandbox/

sandbox/linux/services/credentials.cc

Index: sandbox/linux/services/credentials.cc
diff --git a/sandbox/linux/services/credentials.cc b/sandbox/linux/services/credentials.cc
index f926ce8e85dcc117dabf85ece4f8581c728b94f7..c08f4ed1a22a14d5e1708d80e3c620e9bdbc0934 100644
--- a/sandbox/linux/services/credentials.cc
+++ b/sandbox/linux/services/credentials.cc
@@ -59,7 +59,8 @@ struct FILECloser {
 // TODO(jln): fix base/.
 typedef scoped_ptr<FILE, FILECloser> ScopedFILE;
 
-COMPILE_ASSERT((base::is_same<uid_t, gid_t>::value), UidAndGidAreSameType);
+static_assert((base::is_same<uid_t, gid_t>::value),
+              "uid_t and gid_t should be the same type");
 // generic_id_t can be used for either uid_t or gid_t.
 typedef uid_t generic_id_t;
 
@@ -101,8 +102,8 @@ void ChrootToThreadFdInfo(base::PlatformThreadId tid, bool* result) {
   DCHECK(result);
   *result = false;
 
-  COMPILE_ASSERT((base::is_same<base::PlatformThreadId, int>::value),
-                 TidIsAnInt);
+  static_assert((base::is_same<base::PlatformThreadId, int>::value),
+                "platform thread id should be an int");
   const std::string current_thread_fdinfo = "/proc/" +
       base::IntToString(tid) + "/fdinfo/";