Cleanup, mostly replacing uses of SplitStringUsingSubstr() with SplitString(),

chrome/installer/util/google_update_experiment_util.h

 // Copyright 2013 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.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_EXPERIMENT_UTIL_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_EXPERIMENT_UTIL_H_
 
 #include "base/strings/string16.h"
 
 namespace base {
 class Time;
 }
 
 namespace google_update {
 
 #if defined(OS_WIN)
 // The name of the value where Google Update reads the list of experiments for
 // itself and Chrome.
 extern const wchar_t kExperimentLabels[];
 #endif
 
-// The separator used to separate items in kExperimentLabels.  This is a UTF-8
-// string because it is used on platforms other than Windows.
-extern const char kExperimentLabelSep[];
+// The separator used to separate items in kExperimentLabels.
+extern const base::char16 kExperimentLabelSeparator;
 
 }  // namespace google_update
 
 namespace installer {
 
 // Constructs a date string in the format understood by Google Update for the
 // |current_time| plus one year.
 base::string16 BuildExperimentDateString(const base::Time& current_time);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_EXPERIMENT_UTIL_H_