Replace some Tokenize calls with SplitString.

base/trace_event/trace_event_impl.cc

Index: base/trace_event/trace_event_impl.cc
diff --git a/base/trace_event/trace_event_impl.cc b/base/trace_event/trace_event_impl.cc
index f760b8889d61561773b1f8d398efd4a00ca454bd..8051605a06c83436318d1c9098fb58e44c9b9a0c 100644
--- a/base/trace_event/trace_event_impl.cc
+++ b/base/trace_event/trace_event_impl.cc
@@ -2051,8 +2051,10 @@ TraceEventHandle TraceLog::AddTraceEventWithThreadIdAndTimestamp(
       } else {
         // This is a thread id that we've seen before, but potentially with a
         // new name.
-        std::vector<StringPiece> existing_names;
-        Tokenize(existing_name->second, ",", &existing_names);
+        std::vector<StringPiece> existing_names =
+            base::SplitStringPiece(existing_name->second, ",",
+                                   base::KEEP_WHITESPACE,
+                                   base::SPLIT_WANT_NONEMPTY);
         bool found = std::find(existing_names.begin(),
                                existing_names.end(),
                                new_name) != existing_names.end();