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

extensions/browser/api/serial/serial_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_SERIAL_SERIAL_API_H_
 #define EXTENSIONS_BROWSER_API_SERIAL_SERIAL_API_H_
 
 #include <string>
 
 #include "device/serial/serial.mojom.h"
 #include "extensions/browser/api/api_resource_manager.h"
 #include "extensions/browser/api/async_api_function.h"
 #include "extensions/common/api/serial.h"
 
 namespace extensions {
 
 class SerialConnection;
 
-namespace core_api {
+namespace api {
 
 class SerialEventDispatcher;
 
 class SerialAsyncApiFunction : public AsyncApiFunction {
  public:
   SerialAsyncApiFunction();
 
  protected:
   ~SerialAsyncApiFunction() override;
 
@@ skipping 234 matching lines @@
   ~SerialClearBreakFunction() override;
 
   // AsyncApiFunction:
   bool Prepare() override;
   void Work() override;
 
  private:
   scoped_ptr<serial::ClearBreak::Params> params_;
 };
 
-}  // namespace core_api
+}  // namespace api
 
 }  // namespace extensions
 
 namespace mojo {
 
 template <>
-struct TypeConverter<linked_ptr<extensions::core_api::serial::DeviceInfo>,
+struct TypeConverter<linked_ptr<extensions::api::serial::DeviceInfo>,
                      device::serial::DeviceInfoPtr> {
-  static linked_ptr<extensions::core_api::serial::DeviceInfo> Convert(
+  static linked_ptr<extensions::api::serial::DeviceInfo> Convert(
       const device::serial::DeviceInfoPtr& input);
 };
 
 }  // namespace mojo
 
 #endif  // EXTENSIONS_BROWSER_API_SERIAL_SERIAL_API_H_