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

extensions/browser/api/cast_channel/keep_alive_delegate.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_CAST_CHANNEL_KEEP_ALIVE_DELEGATE_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_KEEP_ALIVE_DELEGATE_H_
 
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "extensions/browser/api/cast_channel/cast_transport.h"
 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
 
 namespace extensions {
-namespace core_api {
+namespace api {
 namespace cast_channel {
 
 class CastSocket;
 class Logger;
 
 // Decorator delegate which provides keep-alive functionality.
 // Keep-alive messages are handled by this object; all other messages and
 // errors are passed to |inner_delegate_|.
 class KeepAliveDelegate : public CastTransport::Delegate {
  public:
@@ skipping 78 matching lines @@
 
   // The PONG message to send over the wire.
   CastMessage pong_message_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(KeepAliveDelegate);
 };
 
 }  // namespace cast_channel
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_KEEP_ALIVE_DELEGATE_H_