Use AuthCredentials throughout the network stack instead of username/password.

net/http/http_auth_cache.cc

Index: net/http/http_auth_cache.cc
diff --git a/net/http/http_auth_cache.cc b/net/http/http_auth_cache.cc
index ac50cec45eab083f4c4d21a0e4ec2e02517eb696..2cc2c0ce556249576f52b298efe7536753b1bca1 100644
--- a/net/http/http_auth_cache.cc
+++ b/net/http/http_auth_cache.cc
@@ -112,8 +112,7 @@ HttpAuthCache::Entry* HttpAuthCache::Add(const GURL& origin,
                                          const std::string& realm,
                                          HttpAuth::Scheme scheme,
                                          const std::string& auth_challenge,
-                                         const string16& username,
-                                         const string16& password,
+                                         const AuthCredentials& credentials,
                                          const std::string& path) {
   CheckOriginIsValid(origin);
   CheckPathIsValid(path);
@@ -138,8 +137,7 @@ HttpAuthCache::Entry* HttpAuthCache::Add(const GURL& origin,
   DCHECK_EQ(scheme, entry->scheme_);
 
   entry->auth_challenge_ = auth_challenge;
-  entry->username_ = username;
-  entry->password_ = password;
+  entry->credentials_ = credentials;
   entry->nonce_count_ = 1;
   entry->AddPath(path);
 
@@ -199,12 +197,11 @@ bool HttpAuthCache::Entry::HasEnclosingPath(const std::string& dir,
 bool HttpAuthCache::Remove(const GURL& origin,
                            const std::string& realm,
                            HttpAuth::Scheme scheme,
-                           const string16& username,
-                           const string16& password) {
+                           const AuthCredentials& credentials) {
   for (EntryList::iterator it = entries_.begin(); it != entries_.end(); ++it) {
     if (it->origin() == origin && it->realm() == realm &&
         it->scheme() == scheme) {
-      if (username == it->username() && password == it->password()) {
+      if (credentials.Equals(it->credentials())) {
         entries_.erase(it);
         return true;
       }
@@ -231,7 +228,7 @@ void HttpAuthCache::UpdateAllFrom(const HttpAuthCache& other) {
     // Add an Entry with one of the original entry's paths.
     DCHECK(it->paths_.size() > 0);
     Entry* entry = Add(it->origin(), it->realm(), it->scheme(),
-                       it->auth_challenge(), it->username(), it->password(),
+                       it->auth_challenge(), it->credentials(),
                        it->paths_.back());
     // Copy all other paths.
     for (Entry::PathList::const_reverse_iterator it2 = ++it->paths_.rbegin();