Net: Convert username and password to string16.

net/http/http_auth_handler.h

Index: net/http/http_auth_handler.h
===================================================================
--- net/http/http_auth_handler.h	(revision 53997)
+++ net/http/http_auth_handler.h	(working copy)
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/string16.h"
 #include "base/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_log.h"
@@ -57,8 +58,8 @@
   // call.
   // Otherwise, there was a problem generating a token synchronously, and the
   // value of |*auth_token| is unspecified.
-  int GenerateAuthToken(const std::wstring* username,
-                        const std::wstring* password,
+  int GenerateAuthToken(const string16* username,
+                        const string16* password,
                         const HttpRequestInfo* request,
                         CompletionCallback* callback,
                         std::string* auth_token);
@@ -137,8 +138,8 @@
   // |GenerateAuthTokenImpl()} is the auth-scheme specific implementation
   // of generating the next auth token. Callers sohuld use |GenerateAuthToken()|
   // which will in turn call |GenerateAuthTokenImpl()|
-  virtual int GenerateAuthTokenImpl(const std::wstring* username,
-                                    const std::wstring* password,
+  virtual int GenerateAuthTokenImpl(const string16* username,
+                                    const string16* password,
                                     const HttpRequestInfo* request,
                                     CompletionCallback* callback,
                                     std::string* auth_token) = 0;