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

extensions/browser/api/bluetooth/bluetooth_private_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_BLUETOOTH_PRIVATE_API_H_
 #define EXTENSIONS_BROWSER_API_BLUETOOTH_BLUETOOTH_PRIVATE_API_H_
 
 #include "base/callback_forward.h"
 #include "extensions/browser/api/bluetooth/bluetooth_extension_function.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
@@ skipping 28 matching lines @@
   static const char* service_name() { return "BluetoothPrivateAPI"; }
   static const bool kServiceRedirectedInIncognito = true;
   static const bool kServiceIsNULLWhileTesting = true;
 
  private:
   friend class BrowserContextKeyedAPIFactory<BluetoothPrivateAPI>;
 
   content::BrowserContext* browser_context_;
 };
 
-namespace core_api {
+namespace api {
 
 class BluetoothPrivateSetAdapterStateFunction
     : public BluetoothExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("bluetoothPrivate.setAdapterState",
                              BLUETOOTHPRIVATE_SETADAPTERSTATE)
   BluetoothPrivateSetAdapterStateFunction();
 
  private:
   ~BluetoothPrivateSetAdapterStateFunction() override;
@@ skipping 60 matching lines @@
   ~BluetoothPrivateSetDiscoveryFilterFunction() override {}
 
   // BluetoothExtensionFunction:
   bool DoWork(scoped_refptr<device::BluetoothAdapter> adapter) override;
 
  private:
   void OnSuccessCallback();
   void OnErrorCallback();
 };
 
-}  // namespace core_api
+}  // namespace api
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_BLUETOOTH_BLUETOOTH_PRIVATE_API_H_