Use StringPiece for UTF string conversions.

net/proxy/proxy_resolver_v8.cc

Index: net/proxy/proxy_resolver_v8.cc
diff --git a/net/proxy/proxy_resolver_v8.cc b/net/proxy/proxy_resolver_v8.cc
index 3de1c7a9f1de3bb4df3146647bf586c41422be7e..c55a6b35c49775adcb90f5b0af23f90062252217 100644
--- a/net/proxy/proxy_resolver_v8.cc
+++ b/net/proxy/proxy_resolver_v8.cc
@@ -223,7 +223,7 @@ bool GetHostnameArgument(const v8::FunctionCallbackInfo<v8::Value>& args,
 
   // Otherwise try to convert it from IDN to punycode.
   const int kInitialBufferSize = 256;
-  url_canon::RawCanonOutputT<char16, kInitialBufferSize> punycode_output;
+  url_canon::RawCanonOutputT<base::char16, kInitialBufferSize> punycode_output;
   if (!url_canon::IDNToASCII(hostname_utf16.data(),
                              hostname_utf16.length(),
                              &punycode_output)) {
@@ -233,9 +233,9 @@ bool GetHostnameArgument(const v8::FunctionCallbackInfo<v8::Value>& args,
   // |punycode_output| should now be ASCII; convert it to a std::string.
   // (We could use UTF16ToASCII() instead, but that requires an extra string
   // copy. Since ASCII is a subset of UTF8 the following is equivalent).
-  bool success = UTF16ToUTF8(punycode_output.data(),
-                             punycode_output.length(),
-                             hostname);
+  bool success = base::UTF16ToUTF8(
+      base::StringPiece16(punycode_output.data(), punycode_output.length()),
+      hostname);
   DCHECK(success);
   DCHECK(IsStringASCII(*hostname));
   return success;