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

extensions/browser/api/cast_channel/cast_auth_ica.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/browser/api/cast_channel/cast_auth_ica.h"
 
 #include "base/base64.h"
 #include "base/lazy_instance.h"
 #include "crypto/signature_verifier.h"
 #include "extensions/browser/api/cast_channel/cast_auth_util.h"
 #include "extensions/common/api/cast_channel/authority_keys.pb.h"
 #include "net/base/hash_value.h"
 #include "net/cert/x509_certificate.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 namespace {
 
 // Fingerprint of the default ICA.
 static const net::SHA256HashValue kDefaultFingerprintICA = { {
     0x52, 0x9D, 0x9C, 0xD6, 0x7F, 0xE5, 0xEB, 0x69, 0x8E, 0x70, 0xDD, 0x26,
     0xD7, 0xD8, 0xF1, 0x26, 0x59, 0xF1, 0xE6, 0xE5, 0x23, 0x48, 0xBF, 0x6A,
     0x5C, 0xF7, 0x16, 0xE1, 0x3F, 0x41, 0x0E, 0x73
 } };
 
@@ skipping 128 matching lines @@
       net::X509Certificate::CalculateFingerprint256(
           ica_cert->os_cert_handle()));
 }
 
 base::StringPiece GetDefaultTrustedICAPublicKey() {
   AuthorityKeyStore& authority_keys_store = g_authority_keys_store.Get();
   return authority_keys_store.GetDefaultICAPublicKey();
 }
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions