Refactor language detection logic to allow non-static CLD data sources.

components/translate/content/browser/data_file_browser_cld_data_provider.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 COMPONENTS_TRANSLATE_CONTENT_BROWSER_DATA_FILE_BROWSER_CLD_DATA_PROVIDER_H_
 #define COMPONENTS_TRANSLATE_CONTENT_BROWSER_DATA_FILE_BROWSER_CLD_DATA_PROVIDER_H_
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "components/translate/content/browser/browser_cld_data_provider.h"
 
+namespace content {
+class WebContents;
+}
+
 namespace translate {
 
 class DataFileBrowserCldDataProvider : public BrowserCldDataProvider {
  public:
   explicit DataFileBrowserCldDataProvider(content::WebContents*);
-  virtual ~DataFileBrowserCldDataProvider();
+  ~DataFileBrowserCldDataProvider() override;
+
   // BrowserCldDataProvider implementations:
-  virtual bool OnMessageReceived(const IPC::Message&) override;
-  virtual void OnCldDataRequest() override;
-  virtual void SendCldDataResponse() override;
+  bool OnMessageReceived(const IPC::Message&) override;
+  void OnCldDataRequest() override;
+  void SendCldDataResponse() override;
 
  private:
   void SendCldDataResponseInternal(const base::File*,
                                    const uint64,
                                    const uint64);
   static void OnCldDataRequestInternal();
 
   content::WebContents* web_contents_;
   scoped_ptr<base::WeakPtrFactory<DataFileBrowserCldDataProvider> >
       weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataFileBrowserCldDataProvider);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CONTENT_BROWSER_DATA_FILE_BROWSER_CLD_DATA_PROVIDER_H_