Update SplitString calls in components

components/variations/net/variations_http_header_provider.cc

 // Copyright 2014 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 "components/variations/net/variations_http_header_provider.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 70 matching lines @@
   if (!variation_ids_header_copy.empty()) {
     // Note that prior to M33 this header was named X-Chrome-Variations.
     headers->SetHeaderIfMissing(kClientData, variation_ids_header_copy);
   }
 }
 
 bool VariationsHttpHeaderProvider::SetDefaultVariationIds(
     const std::string& variation_ids) {
   default_variation_ids_set_.clear();
   default_trigger_id_set_.clear();
-  std::vector<std::string> entries;
-  base::SplitString(variation_ids, ',', &entries);
-  for (std::vector<std::string>::const_iterator it = entries.begin();
-       it != entries.end(); ++it) {
-    if (it->empty()) {
+  for (const base::StringPiece& entry : base::SplitStringPiece(
+           variation_ids, ",", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL)) {
+    if (entry.empty()) {
       default_variation_ids_set_.clear();
       default_trigger_id_set_.clear();
       return false;
     }
-    bool trigger_id = base::StartsWith(*it, "t", base::CompareCase::SENSITIVE);
+    bool trigger_id =
+        base::StartsWith(entry, "t", base::CompareCase::SENSITIVE);
     // Remove the "t" prefix if it's there.
-    std::string entry = trigger_id ? it->substr(1) : *it;
+    base::StringPiece trimmed_entry = trigger_id ?  entry.substr(1) : entry;
 
     int variation_id = 0;
-    if (!base::StringToInt(entry, &variation_id)) {
+    if (!base::StringToInt(trimmed_entry, &variation_id)) {
       default_variation_ids_set_.clear();
       default_trigger_id_set_.clear();
       return false;
     }
     if (trigger_id)
       default_trigger_id_set_.insert(variation_id);
     else
       default_variation_ids_set_.insert(variation_id);
   }
   return true;
@@ skipping 167 matching lines @@
     if (base::EndsWith(host, kSuffixesToSetHeadersFor[i],
                        base::CompareCase::INSENSITIVE_ASCII))
       return true;
   }
 
   return google_util::IsYoutubeDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
                                          google_util::ALLOW_NON_STANDARD_PORTS);
 }
 
 }  // namespace variations