Update SplitString calls to new form

gpu/config/gpu_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/config/gpu_util.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 16 matching lines @@
        it != list.end(); ++it) {
     if (!rt.empty())
       rt += ",";
     rt += base::IntToString(*it);
   }
   return rt;
 }
 
 void StringToIntSet(const std::string& str, std::set<int>* list) {
   DCHECK(list);
-  std::vector<std::string> pieces;
-  base::SplitString(str, ',', &pieces);
-  for (size_t i = 0; i < pieces.size(); ++i) {
+  for (const base::StringPiece& piece :
+       base::SplitStringPiece(str, ",", base::TRIM_WHITESPACE,
+                              base::SPLIT_WANT_ALL)) {
     int number = 0;
-    bool succeed = base::StringToInt(pieces[i], &number);
+    bool succeed = base::StringToInt(piece, &number);
     DCHECK(succeed);
     list->insert(number);
   }
 }
 
 }  // namespace anonymous
 
 void MergeFeatureSets(std::set<int>* dst, const std::set<int>& src) {
   DCHECK(dst);
   if (src.empty())
@@ skipping 22 matching lines @@
                                     IntSetToString(workarounds));
   }
 }
 
 void StringToFeatureSet(
     const std::string& str, std::set<int>* feature_set) {
   StringToIntSet(str, feature_set);
 }
 
 }  // namespace gpu