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

extensions/browser/api/bluetooth_socket/bluetooth_socket_api.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_BLUETOOTH_SOCKET_BLUETOOTH_SOCKET_API_H_
 #define EXTENSIONS_BROWSER_API_BLUETOOTH_SOCKET_BLUETOOTH_SOCKET_API_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 10 matching lines @@
 namespace device {
 class BluetoothSocket;
 }
 
 namespace net {
 class IOBuffer;
 }
 
 namespace extensions {
 
-namespace core_api {
+namespace api {
 
 class BluetoothSocketEventDispatcher;
 
 // Asynchronous API function that performs its work on the BluetoothApiSocket
 // thread while providing methods to manage resources of that class. This
 // follows the pattern of AsyncApiFunction, but does not derive from it,
 // because BluetoothApiSocket methods must be called on the UI Thread.
 class BluetoothSocketAsyncApiFunction : public AsyncExtensionFunction {
  public:
   BluetoothSocketAsyncApiFunction();
@@ skipping 297 matching lines @@
   BluetoothSocketGetSocketsFunction();
 
  protected:
   ~BluetoothSocketGetSocketsFunction() override;
 
   // BluetoothSocketAsyncApiFunction:
   bool Prepare() override;
   void Work() override;
 };
 
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_BLUETOOTH_SOCKET_BLUETOOTH_SOCKET_API_H_