Make various string_util functions take StringPieces instead of char[].

chrome/browser/profile_resetter/resettable_settings_snapshot.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/profile_resetter/resettable_settings_snapshot.h"
 
 #include "base/json/json_writer.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/cancellation_flag.h"
@@ skipping 182 matching lines @@
     dict.Set(kEnabledExtensions, list);
   }
 
   if (field_mask & ResettableSettingsSnapshot::SHORTCUTS) {
     base::ListValue* list = new base::ListValue;
     const std::vector<ShortcutCommand>& shortcuts = snapshot.shortcuts();
     for (std::vector<ShortcutCommand>::const_iterator i = shortcuts.begin();
          i != shortcuts.end(); ++i) {
       base::string16 arguments;
       // Replace "\"" to simplify server-side analysis.
-      base::ReplaceChars(i->second, base::ASCIIToUTF16("\"").c_str(),
+      base::ReplaceChars(i->second, base::ASCIIToUTF16("\""),
                          base::ASCIIToUTF16("\'"), &arguments);
       list->AppendString(arguments);
     }
     dict.Set(kShortcuts, list);
   }
 
   COMPILE_ASSERT(ResettableSettingsSnapshot::ALL_FIELDS == 31,
                  serialize_new_field_here);
 
   std::string json;
@@ skipping 133 matching lines @@
       extension_names += '\n';
     extension_names += i->second;
   }
   if (!extension_names.empty()) {
     AddPair(list.get(),
             l10n_util::GetStringUTF16(IDS_RESET_PROFILE_SETTINGS_EXTENSIONS),
             extension_names);
   }
   return list.Pass();
 }