Add SkBitmap StructTraits for skia::mojo::Bitmap.

content/renderer/image_downloader/image_downloader_impl.cc

Index: content/renderer/image_downloader/image_downloader_impl.cc
diff --git a/content/renderer/image_downloader/image_downloader_impl.cc b/content/renderer/image_downloader/image_downloader_impl.cc
index 0fd476c1ecdc4176d854f6c15d95999b122c701b..9f1ca24be8464bc69629971972e1c62da4f95e6b 100644
--- a/content/renderer/image_downloader/image_downloader_impl.cc
+++ b/content/renderer/image_downloader/image_downloader_impl.cc
@@ -17,7 +17,6 @@
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "net/base/data_url.h"
 #include "skia/ext/image_operations.h"
-#include "skia/public/type_converters.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
@@ -221,7 +220,7 @@ void ImageDownloaderImpl::ReplyDownloadResult(
     const std::vector<gfx::Size>& result_original_image_sizes,
     const DownloadImageCallback& callback) {
   callback.Run(http_status_code,
-               mojo::Array<skia::mojom::BitmapPtr>::From(result_images),
+               mojo::Array<SkBitmap>::From(result_images),
                mojo::Array<mojo::SizePtr>::From(result_original_image_sizes));
 }