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

extensions/browser/api/cast_channel/cast_framer.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_framer.h"
 
 #include <stdlib.h>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/sys_byteorder.h"
 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 MessageFramer::MessageFramer(scoped_refptr<net::GrowableIOBuffer> input_buffer)
     : input_buffer_(input_buffer), error_(false) {
   Reset();
 }
 
 MessageFramer::~MessageFramer() {
 }
 
 MessageFramer::MessageHeader::MessageHeader() : message_size(0) {
@@ skipping 142 matching lines @@
 }
 
 void MessageFramer::Reset() {
   current_element_ = HEADER;
   message_bytes_received_ = 0;
   body_size_ = 0;
   input_buffer_->set_offset(0);
 }
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions