[Payment Request] Update the CurrencyStringFormatter to call the native impl.

components/payments/currency_formatter.cc

Index: components/payments/currency_formatter.cc
diff --git a/components/payments/currency_formatter.cc b/components/payments/currency_formatter.cc
index f333787f521573fd044b819bd990bc0c103dff73..54279b6a0e90de3a7e445320699495ef5f373acd 100644
--- a/components/payments/currency_formatter.cc
+++ b/components/payments/currency_formatter.cc
@@ -17,6 +17,7 @@
 namespace payments {
 
 const char kIso4217CurrencySystem[] = "urn:iso:std:iso:4217";
+
 namespace {
 
 // Support a maximum of 10 fractional digits, similar to the ISO20022 standard.
@@ -47,11 +48,8 @@ CurrencyFormatter::CurrencyFormatter(
   icu_formatter_.reset(
       icu::NumberFormat::createCurrencyInstance(locale_, error_code));
   if (U_FAILURE(error_code)) {
-    icu::UnicodeString name;
-    std::string locale_str;
-    locale_.getDisplayName(name).toUTF8String(locale_str);
     LOG(ERROR) << "Failed to initialize the currency formatter for "
-               << locale_str;
+               << locale_name;
     return;
   }