Fix cases that initialized StringTokenizer with a temporary.

chrome/browser/gtk/options/advanced_contents_gtk.cc

 // Copyright (c) 2009 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/gtk/options/advanced_contents_gtk.h"
 
 #include <sys/types.h>
 #include <sys/wait.h>
 
 #include "app/l10n_util.h"
@@ skipping 393 matching lines @@
     BrowserList::GetLastActive()->
         OpenURL(GURL(l10n_util::GetStringUTF8(IDS_LINUX_PROXY_CONFIG_URL)),
                 GURL(), NEW_FOREGROUND_TAB, PageTransition::LINK);
   }
 }
 
 // static
 bool NetworkSection::SearchPATH(ProxyConfigCommand* commands, size_t ncommands,
                                 size_t* index) {
   const char* path = getenv("PATH");
+  if (!path)
+    return false;
   FilePath bin_path;
-  StringTokenizer tk(path, ":");
+  CStringTokenizer tk(path, path + strlen(path), ":");
   // Search $PATH looking for the commands in order.
   while (tk.GetNext()) {
     for (size_t i = 0; i < ncommands; i++) {
       bin_path = FilePath(tk.token()).Append(commands[i].argv[0]);
       if (file_util::PathExists(bin_path)) {
         commands[i].binary = bin_path.value();
         if (index)
           *index = i;
         return true;
       }
@@ skipping 669 matching lines @@
       l10n_util::GetStringUTF8(IDS_OPTIONS_ADVANCED_SECTION_TITLE_CONTENT),
       web_content_section_->get_page_widget(), false);
 
   security_section_.reset(new SecuritySection(profile_));
   options_builder.AddOptionGroup(
       l10n_util::GetStringUTF8(IDS_OPTIONS_ADVANCED_SECTION_TITLE_SECURITY),
       security_section_->get_page_widget(), false);
 
   page_ = options_builder.get_page_widget();
 }