Replace base::str[n]casecmp with helper functions.

chrome/browser/printing/printing_layout_browsertest.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 "base/command_line.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 189 matching lines @@
     for (int i = 0; i < 100; ++i) {
       base::FileEnumerator enumerator(emf_path_, false,
                                       base::FileEnumerator::FILES);
       emf_file.clear();
       prn_file.clear();
       found_emf = false;
       found_prn = false;
       base::FilePath file;
       while (!(file = enumerator.Next()).empty()) {
         std::wstring ext = file.Extension();
-        if (base::strcasecmp(base::WideToUTF8(ext).c_str(), ".emf") == 0) {
+        if (base::EqualsCaseInsensitiveASCII(base::WideToUTF8(ext), ".emf")) {
           EXPECT_FALSE(found_emf) << "Found a leftover .EMF file: \"" <<
               emf_file << "\" and \"" << file.value() <<
               "\" when looking for \"" << verification_name << "\"";
           found_emf = true;
           emf_file = file.value();
           continue;
         }
-        if (base::strcasecmp(base::WideToUTF8(ext).c_str(), ".prn") == 0) {
+        if (base::EqualsCaseInsensitiveASCII(base::WideToUTF8(ext), ".prn")) {
           EXPECT_FALSE(found_prn) << "Found a leftover .PRN file: \"" <<
               prn_file << "\" and \"" << file.value() <<
               "\" when looking for \"" << verification_name << "\"";
           prn_file = file.value();
           found_prn = true;
           base::DeleteFile(file, false);
           continue;
         }
         EXPECT_TRUE(false);
       }
@@ skipping 231 matching lines @@
 
     // Force a navigation elsewhere to verify that it's fine with it.
     url = test_server()->GetURL("files/printing/test1.html");
     ui_test_utils::NavigateToURL(browser(), url);
   }
   chrome::CloseWindow(browser());
   content::RunAllPendingInMessageLoop();
 
   EXPECT_EQ(0., CompareWithResult(L"iframe")) << L"iframe";
 }