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

extensions/browser/api/document_scan/document_scan_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_DOCUMENT_SCAN_DOCUMENT_SCAN_API_H_
 #define EXTENSIONS_BROWSER_API_DOCUMENT_SCAN_DOCUMENT_SCAN_API_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "extensions/browser/api/async_api_function.h"
 #include "extensions/browser/api/document_scan/document_scan_interface.h"
 #include "extensions/common/api/document_scan.h"
 
 namespace extensions {
 
-namespace core_api {
+namespace api {
 
 class DocumentScanScanFunction : public AsyncApiFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("documentScan.scan", DOCUMENT_SCAN_SCAN)
   DocumentScanScanFunction();
 
  protected:
   ~DocumentScanScanFunction() override;
 
   // AsyncApiFunction:
@@ skipping 11 matching lines @@
   void OnResultsReceived(const std::string& scanned_image,
                          const std::string& mime_type,
                          const std::string& error);
 
   scoped_ptr<document_scan::Scan::Params> params_;
   scoped_ptr<DocumentScanInterface> document_scan_interface_;
 
   DISALLOW_COPY_AND_ASSIGN(DocumentScanScanFunction);
 };
 
-}  // namespace core_api
+}  // namespace api
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DOCUMENT_SCAN_DOCUMENT_SCAN_API_H_