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

extensions/browser/api/cast_channel/keep_alive_delegate.cc

 // Copyright 2015 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 <string>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "extensions/browser/api/cast_channel/cast_message_util.h"
 #include "extensions/browser/api/cast_channel/cast_socket.h"
 #include "extensions/browser/api/cast_channel/keep_alive_delegate.h"
 #include "extensions/browser/api/cast_channel/logger.h"
 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
 #include "extensions/common/api/cast_channel/logging.pb.h"
 #include "net/base/net_errors.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 namespace {
 
 const char kHeartbeatNamespace[] = "urn:x-cast:com.google.cast.tp.heartbeat";
 const char kPingSenderId[] = "chrome";
 const char kPingReceiverId[] = "receiver-0";
 const char kTypeNodeId[] = "type";
 
 // Determines if the JSON-encoded payload is equivalent to
 // { "type": |chk_type| }
@@ skipping 164 matching lines @@
 
 void KeepAliveDelegate::Stop() {
   if (started_) {
     started_ = false;
     ping_timer_->Stop();
     liveness_timer_->Stop();
   }
 }
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions