Revert "Implement a JavaScript API for document scanning"

chrome/browser/extensions/api/document_scan/document_scan_interface_nonchromeos.cc

-// 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.
-
-#include "chrome/browser/extensions/api/document_scan/document_scan_interface.h"
-
-namespace {
-
-const char kScanFunctionNotImplementedError[] = "Scan function not implemented";
-
-}  // namespace
-
-namespace extensions {
-
-namespace api {
-
-class DocumentScanInterfaceImpl : public DocumentScanInterface {
- public:
-  DocumentScanInterfaceImpl() {}
-  virtual ~DocumentScanInterfaceImpl() {}
-
-  virtual void ListScanners(
-      const ListScannersResultsCallback& callback) override {
-    callback.Run(std::vector<ScannerDescription> (), "");
-  }
-  virtual void Scan(const std::string& scanner_name,
-                    ScanMode mode,
-                    int resolution_dpi,
-                    const ScanResultsCallback& callback) override {
-    callback.Run("", "", kScanFunctionNotImplementedError);
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DocumentScanInterfaceImpl);
-};
-
-// static
-DocumentScanInterface *DocumentScanInterface::CreateInstance() {
-  return new DocumentScanInterfaceImpl();
-}
-
-}  // namespace api
-
-}  // namespace extensions