Update some uses of char16 to use the base:: namespace.

net/http/http_auth_filter_win.h

Index: net/http/http_auth_filter_win.h
diff --git a/net/http/http_auth_filter_win.h b/net/http/http_auth_filter_win.h
index 24305b511ecca35b1a12ff43a0b88102a69633b3..d2c0af4a09dc8463646af1907d00428c37629667 100644
--- a/net/http/http_auth_filter_win.h
+++ b/net/http/http_auth_filter_win.h
@@ -20,13 +20,13 @@ enum RegistryHiveType {
 namespace http_auth {
 
 // The common path to all the registry keys containing domain zone information.
-extern const char16 kRegistryInternetSettings[];
-extern const char16 kSettingsMachineOnly[];
-extern const char16* kRegistryEntries[3];       // L"http", L"https", and L"*"
+extern const base::char16 kRegistryInternetSettings[];
+extern const base::char16 kSettingsMachineOnly[];
+extern const base::char16* kRegistryEntries[3];  // L"http", L"https", and L"*"
 
-extern const char16* GetRegistryWhitelistKey();
+extern const base::char16* GetRegistryWhitelistKey();
 // Override the whitelist key.  Passing in NULL restores the default value.
-extern void SetRegistryWhitelistKey(const char16* new_whitelist_key);
+extern void SetRegistryWhitelistKey(const base::char16* new_whitelist_key);
 extern bool UseOnlyMachineSettings();
 
 }  // namespace http_auth