Make some updates to extension iconography.

extensions/browser/image_loader.h

Index: extensions/browser/image_loader.h
diff --git a/extensions/browser/image_loader.h b/extensions/browser/image_loader.h
index 3a7c1b4c607024d1b5ece976d77522758fc49538..8c1f446f3c2270a24a7594f3aec75c3bec95495b 100644
--- a/extensions/browser/image_loader.h
+++ b/extensions/browser/image_loader.h
@@ -80,15 +80,24 @@ class ImageLoader : public KeyedService {
   // if the image was found in the cache.
   // Note this method loads a raw bitmap from the resource. All sizes given are
   // assumed to be in pixels.
-  void LoadImageAsync(const extensions::Extension* extension,
+  // TODO(estade): remove this in favor of LoadImageAtEveryScaleFactorAsync,
+  // and rename the latter to LoadImageAsync.
+  void LoadImageAsync(const Extension* extension,
                       const ExtensionResource& resource,
                       const gfx::Size& max_size,
                       const ImageLoaderImageCallback& callback);
 
+  // Loads and returns a gfx::Image that has representations at all supported
+  // scale factors.
+  void LoadImageAtEveryScaleFactorAsync(
+      const Extension* extension,
+      const gfx::Size& dip_size,
+      const ImageLoaderImageCallback& callback);
+
   // Same as LoadImageAsync() above except it loads multiple images from the
   // same extension. This is used to load multiple resolutions of the same image
   // type.
-  void LoadImagesAsync(const extensions::Extension* extension,
+  void LoadImagesAsync(const Extension* extension,
                        const std::vector<ImageRepresentation>& info_list,
                        const ImageLoaderImageCallback& callback);
 
@@ -99,7 +108,7 @@ class ImageLoader : public KeyedService {
   //
   // If multiple images of the same logical size are loaded, they will be
   // combined into a single ImageSkia in the ImageFamily.
-  void LoadImageFamilyAsync(const extensions::Extension* extension,
+  void LoadImageFamilyAsync(const Extension* extension,
                             const std::vector<ImageRepresentation>& info_list,
                             const ImageLoaderImageFamilyCallback& callback);