Fix some case-insensitive cases for StartsWith

chrome/installer/gcapi/gcapi_omaha_experiment.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 "chrome/installer/gcapi/gcapi_omaha_experiment.h"
 
 #include "base/basictypes.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 29 matching lines @@
                                                   &original_labels)) {
     return false;
   }
 
   // Split the original labels by the label separator.
   std::vector<base::string16> entries;
   base::SplitString(original_labels, google_update::kExperimentLabelSeparator,
                     &entries);
 
   // Keep all labels, but the one we want to add/replace.
+  base::string16 label_and_separator(label);
+  label_and_separator.push_back('=');
   base::string16 new_labels;
-  for (std::vector<base::string16>::const_iterator it = entries.begin();
-       it != entries.end(); ++it) {
-    if (!it->empty() && !base::StartsWith(*it, label + L"=", true)) {
-      new_labels += *it;
+  for (const base::string16& entry : entries) {
+    if (!entry.empty() &&
+        !base::StartsWith(entry, label_and_separator,
+                          base::CompareCase::SENSITIVE)) {
+      new_labels += entry;
       new_labels += google_update::kExperimentLabelSeparator;
     }
   }
 
   new_labels.append(
       gcapi_internals::GetGCAPIExperimentLabel(brand_code, label));
 
   return GoogleUpdateSettings::SetExperimentLabels(system_level,
                                                    new_labels);
 }
@@ skipping 32 matching lines @@
 bool SetReactivationExperimentLabels(const wchar_t* brand_code,
                                      int shell_mode) {
   return SetExperimentLabel(brand_code, gcapi_internals::kReactivationLabel,
                             shell_mode);
 }
 
 bool SetRelaunchExperimentLabels(const wchar_t* brand_code, int shell_mode) {
   return SetExperimentLabel(brand_code, gcapi_internals::kRelaunchLabel,
                             shell_mode);
 }