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

extensions/browser/api/cast_channel/cast_auth_util_unittest.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_util.h"
 
 #include <string>
 
 #include "base/macros.h"
 #include "extensions/browser/api/cast_channel/cast_auth_ica.h"
 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 namespace {
 
 const unsigned char kIntermediateCertificate[] = {
   0x30, 0x82, 0x03, 0x87, 0x30, 0x82, 0x02, 0x6f, 0xa0, 0x03,
   0x02, 0x01, 0x02, 0x02, 0x01, 0x01, 0x30, 0x0d, 0x06, 0x09,
   0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05,
   0x00, 0x30, 0x7c, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55,
   0x04, 0x06, 0x13, 0x02, 0x55, 0x53, 0x31, 0x13, 0x30, 0x11,
   0x06, 0x03, 0x55, 0x04, 0x08, 0x0c, 0x0a, 0x43, 0x61, 0x6c,
@@ skipping 379 matching lines @@
   MangleString(&peer_cert);
   AuthResult result = VerifyCredentials(
       auth_response, peer_cert);
   EXPECT_FALSE(result.success());
   EXPECT_EQ(AuthResult::ERROR_SIGNED_BLOBS_MISMATCH,
             result.error_type);
 }
 
 }  // namespace
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions