Make image_decoder a Leaky LazyInstance

chrome/browser/image_decoder.h

Index: chrome/browser/image_decoder.h
diff --git a/chrome/browser/image_decoder.h b/chrome/browser/image_decoder.h
index 2206dd9f454ebcbfc3a29674cf41e1d42eb594ee..b1b22e358ddf3bcb40ccadc49f178b2dfc9a0eee 100644
--- a/chrome/browser/image_decoder.h
+++ b/chrome/browser/image_decoder.h
@@ -15,7 +15,9 @@
 
 class SkBitmap;
 
-// Decodes an image in a sandboxed process.
+// Decodes an image in a sandboxed process. This class is deprecated and will be
+// removed once crbug.com/<TODO(twellington): fill this in once deprecation is
+// approved and bug is created> is resolved. Use ImageBatchDecoder instead.
 class ImageDecoder : public content::UtilityProcessHostClient {
  public:
   class Delegate {
@@ -66,8 +68,8 @@ class ImageDecoder : public content::UtilityProcessHostClient {
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // IPC message handlers.
-  void OnDecodeImageSucceeded(const SkBitmap& decoded_image);
-  void OnDecodeImageFailed();
+  void OnDecodeImageSucceeded(const SkBitmap& decoded_image, int id);
+  void OnDecodeImageFailed(int id);
 
   // Launches sandboxed process that will decode the image.
   void DecodeImageInSandbox(const std::vector<unsigned char>& image_data);