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

chrome/browser/printing/printing_layout_browsertest.cc

Index: chrome/browser/printing/printing_layout_browsertest.cc
diff --git a/chrome/browser/printing/printing_layout_browsertest.cc b/chrome/browser/printing/printing_layout_browsertest.cc
index 4e1d2b731d83b59285968ef918efe9c1097c8305..4755a18a00755499607662a581d2fce834187c57 100644
--- a/chrome/browser/printing/printing_layout_browsertest.cc
+++ b/chrome/browser/printing/printing_layout_browsertest.cc
@@ -207,7 +207,7 @@ class PrintingLayoutTest : public PrintingTest<InProcessBrowserTest>,
       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 << "\"";
@@ -215,7 +215,7 @@ class PrintingLayoutTest : public PrintingTest<InProcessBrowserTest>,
           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 << "\"";