Don't use LazyInstance in chrome/browser/image_decoder.*

chrome/browser/image_decoder.h

 // Copyright (c) 2012 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 CHROME_BROWSER_IMAGE_DECODER_H_
 #define CHROME_BROWSER_IMAGE_DECODER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 53 matching lines @@
   };
 
   enum ImageCodec {
     DEFAULT_CODEC = 0,  // Uses WebKit image decoding (via WebImage).
 #if defined(OS_CHROMEOS)
     ROBUST_JPEG_CODEC,  // Restrict decoding to robust jpeg codec.
     ROBUST_PNG_CODEC,  // Restrict decoding to robust PNG codec.
 #endif  // defined(OS_CHROMEOS)
   };
 
-  ImageDecoder();
-  ~ImageDecoder();
+  static ImageDecoder* GetInstance();
 
   // Calls StartWithOptions() with ImageCodec::DEFAULT_CODEC and
   // shrink_to_fit = false.
   static void Start(ImageRequest* image_request,
                     std::vector<uint8_t> image_data);
   // Deprecated. Use std::vector<uint8_t> version to avoid an extra copy.
   static void Start(ImageRequest* image_request,
                     const std::string& image_data);
 
   // Starts asynchronous image decoding. Once finished, the callback will be
   // posted back to image_request's |task_runner_|.
   static void StartWithOptions(ImageRequest* image_request,
                                std::vector<uint8_t> image_data,
                                ImageCodec image_codec,
                                bool shrink_to_fit);
   // Deprecated. Use std::vector<uint8_t> version to avoid an extra copy.
   static void StartWithOptions(ImageRequest* image_request,
                                const std::string& image_data,
                                ImageCodec image_codec,
                                bool shrink_to_fit);
 
   // Removes all instances of |image_request| from |image_request_id_map_|,
   // ensuring callbacks are not made to the image_request after it is destroyed.
   static void Cancel(ImageRequest* image_request);
 
  private:
   using RequestMap = std::map<int, ImageRequest*>;
 
+  ImageDecoder();
+  ~ImageDecoder() = delete;
+
   void StartWithOptionsImpl(ImageRequest* image_request,
                             std::vector<uint8_t> image_data,
                             ImageCodec image_codec,
                             bool shrink_to_fit);
 
   void CancelImpl(ImageRequest* image_request);
 
   // IPC message handlers.
   void OnDecodeImageSucceeded(const SkBitmap& decoded_image, int request_id);
   void OnDecodeImageFailed(int request_id);
 
   // id to use for the next Start() request that comes in.
   int image_request_id_counter_;
 
   // Map of request id's to ImageRequests.
   RequestMap image_request_id_map_;
 
   // Protects |image_request_id_map_| and |image_request_id_counter_|.
   base::Lock map_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };
 
 #endif  // CHROME_BROWSER_IMAGE_DECODER_H_