Update SplitString calls in chrome.

chrome/browser/predictors/resource_prefetch_common.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 "chrome/browser/predictors/resource_prefetch_common.h"
 
 #include <stdlib.h>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 16 matching lines @@
 const char kSpeculativePrefetchingTrialName[] =
     "SpeculativeResourcePrefetching";
 
 /*
  * SpeculativeResourcePrefetching is a field trial, and its value must have the
  * following format: key1=value1:key2=value2:key3=value3
  * e.g. "Prefetching=Enabled:Predictor=Url:Confidence=High"
  * The function below extracts the value corresponding to a key provided from
  * the SpeculativeResourcePrefetching field trial.
  */
-string GetFiledTrialSpecValue(string key) {
-  vector<string> elements;
-  base::SplitString(
-      FieldTrialList::FindFullName(kSpeculativePrefetchingTrialName),
-      ':',
-      &elements);
-  for (int i = 0; i < static_cast<int>(elements.size()); i++) {
-    vector<string> key_value;
-    base::SplitString(elements[i], '=', &key_value);
+std::string GetFiledTrialSpecValue(string key) {
+  std::string trial_name =
+      FieldTrialList::FindFullName(kSpeculativePrefetchingTrialName);
+  for (const base::StringPiece& element : base::SplitStringPiece(
+           trial_name, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+    std::vector<base::StringPiece> key_value = base::SplitStringPiece(
+        element, "=", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     if (key_value.size() == 2 && key_value[0] == key)
-      return key_value[1];
+      return key_value[1].as_string();
   }
   return string();
 }
 
 bool IsSpeculativeResourcePrefetchingEnabled(
     Profile* profile,
     ResourcePrefetchPredictorConfig* config) {
   DCHECK(config);
 
   // Off the record - disabled.
@@ skipping 204 matching lines @@
 
 bool ResourcePrefetchPredictorConfig::IsMoreResourcesEnabledForTest() const {
   return max_resources_per_entry == 100;
 }
 
 bool ResourcePrefetchPredictorConfig::IsSmallDBEnabledForTest() const {
   return max_urls_to_track == 200 && max_hosts_to_track == 100;
 }
 
 }  // namespace predictors