Update uses of UTF conversions in content/ to use the base:: namespace.

content/shell/app/webkit_test_platform_support_win.cc

Index: content/shell/app/webkit_test_platform_support_win.cc
diff --git a/content/shell/app/webkit_test_platform_support_win.cc b/content/shell/app/webkit_test_platform_support_win.cc
index 59156fe891cb85bd5b7ff5bf4a89ff0d03223ccf..938bd19dcc58987a7dc28c54a4792f7ed5e7fb5e 100644
--- a/content/shell/app/webkit_test_platform_support_win.cc
+++ b/content/shell/app/webkit_test_platform_support_win.cc
@@ -36,7 +36,7 @@ bool SetupFonts() {
 
   std::string font_buffer;
   if (!base::ReadFileToString(font_path, &font_buffer)) {
-    std::cerr << "Failed to load font " << WideToUTF8(font_path.value())
+    std::cerr << "Failed to load font " << base::WideToUTF8(font_path.value())
               << "\n";
     return false;
   }