JPEG decoding: replace ownership comments with std::unique_ptr.

chrome/browser/android/ntp/most_visited_sites.cc

Index: chrome/browser/android/ntp/most_visited_sites.cc
diff --git a/chrome/browser/android/ntp/most_visited_sites.cc b/chrome/browser/android/ntp/most_visited_sites.cc
index e5305e05cdc3d2362e9a12d3148e549687babaaf..25fb37c92abc7a1f3bf322cc7b36c477ddb626c9 100644
--- a/chrome/browser/android/ntp/most_visited_sites.cc
+++ b/chrome/browser/android/ntp/most_visited_sites.cc
@@ -93,7 +93,7 @@ std::unique_ptr<SkBitmap> MaybeFetchLocalThumbnail(
   scoped_refptr<base::RefCountedMemory> image;
   std::unique_ptr<SkBitmap> bitmap;
   if (top_sites && top_sites->GetPageThumbnail(url, false, &image))
-    bitmap.reset(gfx::JPEGCodec::Decode(image->front(), image->size()));
+    bitmap = gfx::JPEGCodec::Decode(image->front(), image->size());
   return bitmap;
 }