Generate all extension schema namespaces as "api" and instead vary the generated bundle names.

extensions/common/cast/cast_cert_validator.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/common/cast/cast_cert_validator.h"
 
 #include "extensions/browser/api/cast_channel/cast_auth_ica.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_crypto {
 
 VerificationResult::VerificationResult()
     : VerificationResult("", ERROR_NONE, 0) {
 }
 
 VerificationResult::VerificationResult(const std::string& in_error_message,
                                        ErrorType in_error_type)
     : VerificationResult(in_error_message, in_error_type, 0) {
 }
 
 VerificationResult::VerificationResult(const std::string& in_error_message,
                                        ErrorType in_error_type,
                                        int in_error_code)
     : error_type(in_error_type),
       error_message(in_error_message),
       library_error_code(in_error_code) {
 }
 
 bool SetTrustedCertificateAuthoritiesForTest(const std::string& keys,
                                              const std::string& signature) {
-  return extensions::core_api::cast_channel::SetTrustedCertificateAuthorities(
+  return extensions::api::cast_channel::SetTrustedCertificateAuthorities(
       keys, signature);
 }
 
 }  // namespace cast_crypto
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions